Motivating factors for high rates of influenza vaccination among healthcare workers

Background

Recent guidance from related regulatory agencies and medical societies supports mandatory vaccination of healthcare workers (HCW) against influenza. At St. Jude Children's Research Hospital, a pediatric oncology referral center, more than 90% of HCWs receive vaccine each year without a policy mandating immunization. Factors associated with HCW uptake of influenza vaccines have not previously been evaluated in a high compliance rate setting.

Methods

A structured, anonymous, electronic questionnaire was distributed in August 2010 to employees (HCW and non-HCW). Demographics, prior receipt of influenza vaccines, reasons for acceptance or refusal of seasonal and 2009 H1N1 pandemic vaccine, and attitudes on mandatory vaccination were assessed.

Results

95.0% of 925 HCWs and 63.1% of all 3227 qualifying employees responded to the survey. 93.8% and 75.2% of HCW reported receiving seasonal and 2009 H1N1 influenza vaccines, respectively, in the 2009-2010 season. Benefits to self and/or patients were cited as the most frequent reasons for accepting seasonal (83.5% and 78.3%, respectively) and 2009 H1N1 (85.9% and 81.1%, respectively) vaccination. 36.6% of HCWs opposed mandating influenza vaccination; 88.2% and 59.9% of whom reported receiving the seasonal and 2009 H1N1 influenza vaccines, respectively. Violation of freedom of choice and personal autonomy were the most frequently reported reasons for opposition.

Conclusion

In this cohort of HCWs with a high influenza vaccination rate, realistic assessments of the potential benefits of vaccination appear to have driven the choice to accept immunization. Despite this, mandating vaccination was viewed unfavorably by a significant minority of vaccinated individuals. Employee concerns over autonomy should be addressed as institutions transition to mandatory vaccination policies.     

Economic analysis of measles elimination program in the Republic of Korea, 2001: A cost benefit analysis study

Background

In this study, we modeled the cost benefit analysis for three different measles vaccination strategies based upon three different measles-containing vaccines in Korea, 2001. We employed an economic analysis model using vaccination coverage data and population-based measles surveillance data, along with available estimates of the costs for the different strategies. In addition, we have included analysis on benefit of reduction of complication by mumps and rubella.

Methods

We evaluated four different strategies: strategy 1, keep-up program with a second dose measles-mumps-rubella (MMR) vaccine at 4–6 years without catch-up campaign; strategy 2, additional catch-up campaign with measles (M) vaccine; strategy 3, catch-up campaign with measles-rubella (MR) vaccine; and strategy 4, catch-up campaign with MMR vaccine. The cost of vaccination included cost for vaccines, vaccination practices and other administrative expenses. The direct benefit of estimated using data from National Health Insurance Company, a government-operated system that reimburses all medical costs spent on designated illness in Korea.

Results

With the routine one-dose MMR vaccination program, we estimated a baseline of 178,560 measles cases over the 20 years; when the catch-up campaign with M, MR or MMR vaccines was conducted, we estimated the measles cases would decrease to 5936 cases. Among all strategies, the two-dose MMR keep-up program with MR catch-up campaign showed the highest benefit-cost ratio of 1.27 with a net benefit of 51.6 billion KRW.

Conclusion

Across different vaccination strategies, our finding suggest that MR catch-up campaign in conjunction with two-dose MMR keep-up program was the most appropriate option in terms of economic costs and public health effects associated with measles elimination strategy in Korea.     

Factors associated with uptake of seasonal and pandemic influenza vaccine among clinical risk groups in the UK: an analysis using the General Practice Research Database

Background

Influenza vaccine uptake rates are low compared with uptake rates of many other vaccines. It is unclear how this differs between risk groups in the population and between pandemic and non-pandemic influenza vaccines.

Aim

This study sought to estimate uptake rates of pandemic and seasonal influenza vaccines among clinical risk groups in the UK during the 2009/2010 influenza season and to identify predictors of vaccine uptake in this cohort.

Methods

Uptake rates were calculated using data from the UK General Practice Research Database (GPRD). Predictors of vaccination were identified using a modified Poisson regression with robust standard error estimates.

Results

Uptake of pandemic influenza vaccine in clinical risk groups was 40.3% and uptake of seasonal influenza vaccine was 61.3%. Factors found to be predictive of seasonal and pandemic influenza vaccination included age and the total number of underlying health conditions an individual had. At risk individuals in those age groups in which universal vaccination of the general population was recommended were more likely to have been vaccinated than individuals in age groups in which only clinical risk groups were recommended for vaccination; hence children in clinical risk groups were more likely to receive pandemic than seasonal influenza vaccine. In older people, having a history of Guillain Barré syndrome was associated with a reduced likelihood of receipt of both seasonal (IRR_adj 0.83, CI₉₅ 0.77–0.90) and pandemic influenza vaccines (IRR_adj 0.82, CI₉₅ 0.73–0.92).

Discussion

Uptake of pandemic influenza vaccine was lower than that of seasonal influenza vaccine among those at a clinically high risk of influenza related morbidity. This suggests that vaccination strategies may need to be altered during future pandemics. Recommending universal vaccination within age categories in which there is a large proportion of high risk individuals could be considered as this may result in higher uptake among clinical risk groups.     

How influenza vaccination policy may affect vaccine logistics

Background

When policymakers make decision about the target populations and timing of influenza vaccination, they may not consider the impact on the vaccine supply chains, which may in turn affect vaccine availability.

Purpose

Our goal is to explore the effects on the Thailand vaccine supply chain of introducing influenza vaccines and varying the target populations and immunization time-frames.

Methods

We Utilized our custom-designed software HERMES (Highly Extensible Resource for Modeling Supply Chains), we developed a detailed, computational discrete-event simulation model of the Thailand's National Immunization Program (NIP) supply chain in Trang Province, Thailand. A suite of experiments simulated introducing influenza vaccines for different target populations and over different time-frames prior to and during the annual influenza season.

Results

Introducing influenza vaccines creates bottlenecks that reduce the availability of both influenza vaccines as well as the other NIP vaccines, with provincial to district transport capacity being the primary constraint. Even covering only 25% of the Advisory Committee on Immunization Practice-recommended population while administering the vaccine over six months hinders overall vaccine availability so that only 62% of arriving patients can receive vaccines. Increasing the target population from 25% to 100% progressively worsens these bottlenecks, while increasing influenza vaccination time-frame from 1 to 6 months decreases these bottlenecks.

Conclusion

Since the choice of target populations for influenza vaccination and the time-frame to deliver this vaccine can substantially affect the flow of all vaccines, policy-makers may want to consider supply chain effects when choosing target populations for a vaccine.     

Determinants of willingness to pay for self-paid vaccines in China

Background

While vaccines not covered by China's Expanded Program on Immunization can be received voluntarily with out-of-pocket payment, the uptake of self-paid vaccines in China is low.

Objective

To investigate willingness to pay (WTP) for self-paid vaccines and its determinants in China.

Methods

We interviewed 2160 randomly selected households with children 0–3 years old, in 108 communities from three provinces in 2013. A bidding game method was used to elicit WTP for two self-paid vaccines: 7-valent pneumococcal conjugate vaccine and influenza vaccine. We conducted multivariate linear regressions to determine factors affecting the WTP.

Results

Median WTP for pneumococcal conjugate vaccine and influenza vaccine were Chinese Yuan 200 and 60 (10 US Dollars). 92% and 55% of respondents, respectively were not willing to pay the market price for these two vaccines. Lower price barrier and higher ability to pay were associated with higher WTP. Those with better vaccine or disease-related knowledge, higher perceived vulnerability and severity of diseases were willing to pay more. However, perceived effectiveness and safety barriers to vaccination had no significant effects on the WTP. Recommendations from peers and healthcare providers increased the WTP. Fathers and grand parents of children had a higher WTP than their mothers. The WTP decreased with age, but was not affected by education and occupation.

Conclusions

The majority of individuals, in our study, were not willing to pay the market price for self-paid vaccines against high-burden diseases in China. The economic barriers to vaccination should therefore be removed to increase the demand. Region-specific information about disease burden, fiscal capacity and cost-effectiveness is important for the development of local financing policy in order to cover vaccination costs. Interventions targeting psychosocial factors, such as health education and communication with providers and peers, could also be effective in increasing the uptake of these vaccinations.     

Évolution de la couverture vaccinale de l’année scolaire 2003–2004 à 2007–2008 pour les enfants de cinq à six ans à Genève

Objective

The authors had for aim to study the evolution of vaccination coverage for diphtheria, tetanus, pertussis, poliomyelitis, measles, mumps, rubella (MMR) and Haemophilus influenzae b (Hib) in 5 to 6-year-old children in Geneva, from school year 2003–2004 to 2006–2007.

Design

The data was collected from vaccination cards of 17,184 children attending public schools in the Geneva canton.

Results

The average vaccination coverage over the study period was 93.4% for diphtheria, 93.5% for tetanus, 92.5% for pertussis, and 92.4% for poliomyelitis. For MMR and Hib, the coverage was 80.6, 78.4, 79.1 and 81.2% respectively. Between 2003 and 2007, an increase of coverage was observed for all vaccines. It was especially observed for MMR and Hib vaccines, even though the coverage remained below 90%.

Conclusion

In the Geneva canton, epidemiological surveillance of vaccination coverage of 5 to 6-year-old children can be achieved through systematic data analysis of children's vaccination cards. All commonly used vaccines reached the recommended coverage rates, except for MMR and Hib, even though their coverage had significantly increased.     

The impact of pandemic A(H1N1)pdm09 influenza and vaccine-associated adverse events on parental attitudes and influenza vaccine uptake in young children

Introduction

Parental attitudes towards vaccination significantly influence vaccine uptake. The A(H1N1)pdm09 influenza pandemic was followed in 2010 by an unprecedented increase in febrile reactions in children receiving trivalent inactivated influenza vaccine manufactured by bioCSL. Uptake of TIV in children <5 years in Western Australia (WA) decreased in 2010 and has remained low. The impact of pandemic A(H1N1)pdm09 and adverse-events on parental attitudes towards vaccination is uncertain.

Materials and Methods

A parental attitudes survey towards influenza illness and vaccination was conducted as part of the West Australian Influenza Vaccine Effectiveness study. Vaccination status was assessed by parental interview and confirmed by the national register and/or vaccine providers. Parental attitudes from vaccinated and unvaccinated children and attitudes in 2008–2009 and 2010–2012 were compared. Principal Component Analysis was conducted to determine core attitudes that influenced vaccine uptake.

Results

Vaccination history and parental attitude surveys were available from 2576 children. Parents of fully vaccinated children less frequently stated that influenza was a mild disease, more frequently stated that influenza vaccine was safe and were less frequently worried about vaccine side effects.Uptake of influenza vaccine decreased significantly from 2010 onwards. From 2010, parents were less concerned about severe influenza, but more concerned about vaccine side effects and safety. Despite this significant shift in attitudes towards influenza vaccine, parental acceptance of vaccines on the national immunisation program did not change. Principal Component Analysis revealed that attitudes around vaccine safety and efficacy were the most important attitudes impacting on vaccine uptake.

Conclusions

Parental attitudes to influenza vaccine changed from 2010. Confidence in the WA preschool influenza vaccination program remains low yet appeared unchanged for other vaccines. Restoring public confidence in childhood influenza vaccination is needed before uptake can be improved.     

Medicaid reimbursement and the uptake of adolescent vaccines

Background

In light of low adolescent vaccination rates, state-level policies that could improve vaccine coverage should be evaluated. Approximately 1/3 of adolescents are eligible, primarily through Medicaid enrollment, to receive vaccines from state-administered Vaccines for Children (VFC) programs. We investigated whether Medicaid reimbursement, the scope of implementation of VFC programs (i.e. limited or universal purchase), and/or presence of school-based vaccine mandates were associated with adolescent vaccination levels.

Methods

We performed a cross-sectional analysis of state-level associations between these policies and 2009 National Immunization Survey-TEEN vaccination rates for tetanus-containing, meningococcal conjugate (MCV4), and among females only, human papillomavirus (HPV) vaccines.

Results

Medicaid reimbursement was not associated with vaccine coverage rates after adjusting for presence of vaccine-related school mandates, type of VFC program, proportion of adolescents attending preventive care visits, and state-specific distribution of insurance coverage. Participation in a more expansive VFC program (universal or universal-select) was significantly associated with HPV vaccine coverage, but not tetanus-containing vaccine or MCV4, among states that had mandates for any vaccines.

Conclusions

Our results suggest that, contrary to what has been shown for childhood vaccines, raising Medicaid reimbursement rates may not improve adolescent vaccine utilization. Instead, other policy changes may be more effective, such as expansion of VFC programs into universal purchase programs, further implementation of school-based vaccine mandates and efforts to raise preventive care visits among adolescents.     

Influenza vaccination of health care workers in hospitals—A review of studies on attitudes and predictors

Introduction

Immunization guidelines from many countries recommend influenza vaccination of health care workers (HCW). However, influenza vaccination rates among HCW are universally low. To aid in designing effective immunization programs we reviewed the literature for studies reporting on (1) self-reported reasons of HCW regarding vaccination against influenza and (2) predictive factors for influenza vaccination in HCW.

Methods

We searched PUBMED for relevant publications from 1980 to 2008 with predetermined search strategies and applied pre-defined criteria for inclusion or exclusion. To be included in the review as a predictor study, a multivariate analysis must have been conducted.

Results

We included 25 studies relevant to self-reported reasons for rejecting or accepting vaccination. These studies identified two major reasons for lack of vaccine uptake by HCW: firstly, a wide range of misconceptions or lack of knowledge about influenza infection; and secondly, a lack of convenient access to vaccine. In contrast, among studies reporting on reasons for vaccination acceptance, all but two found that HCW stated self-protection was the most important reason. In the area of “predictive factors for influenza vaccination”, we included 13 studies. At least five of them identified the following three factors: previous receipt of influenza vaccine, belief in the vaccine's effectiveness, and older age.

Conclusion

Our findings indicate that if HCW get immunized against influenza, they do so primarily for their own benefit and not for the benefit to their patients. Misconceptions about influenza and influenza vaccine could be improved by education, and organizational barriers could be bridged with sustainable, structural changes to allow flexible and workplace vaccine delivery.     

Seasonal influenza vaccine efficacy and its determinants in children and non-elderly adults: A systematic review with meta-analyses of controlled trials

Context

The true level of influenza vaccine efficacy is controversial and many factors may influence its estimation.

Objectives

To estimate the efficacy of vaccination of children and non-elderly adults for the prevention of influenza and to explore the impact of type of vaccine, age, degree of strain matching, influenza type and case ascertainment methods on vaccine efficacy estimates.

Data sources

Medline and EmBase databases until October 2011. References of relevant articles were also reviewed.

Study selection

Controlled trials evaluating seasonal influenza vaccines and presenting incidence of laboratory-confirmed influenza illness were eligible. Studies exploring efficacy after experimental challenge, presenting duplicate data, employing group randomization, or focusing on special populations were excluded.

Data extraction

The vaccine effect on influenza prevention was evaluated by calculating Mantel–Haenszel risk ratios (RR) and using random-effects models. Vaccine efficacies were calculated for each comparison as (1 − RR) × 100.

Results

Thirty studies were included in one or more of a total of 101 analyses, comprising 88.468 study participants. There was evidence of heterogeneity in 49% of the analyses. Summary vaccine efficacy was 65% against any strain, 78% against matched strains and 55% against not-matched strains. Both live-attenuated and inactivated vaccines showed similar levels of protection against not-matched strains (60% and 55%, respectively). Live-attenuated vaccines performed better than inactivated vaccines in children (80% versus 48%), whereas inactivated vaccines performed better than live-attenuated vaccines in adults (59% versus 39%). There was a large difference (20%) in efficacy against influenza A (69%) and influenza B (49%) types for not-matched strains. Summary estimates of vaccine efficacy were highest when ascertainment was based on culture confirmation.

Conclusion

Influenza vaccines are efficacious, but efficacy estimates depend on many variables including type of vaccine and age of vaccinees, degree of matching of the circulating strains to the vaccine, influenza type, and methods of case ascertainment.     

Theory-based predictors of influenza vaccination among pregnant women

Background

Guidelines recommend influenza vaccination for pregnant women, but vaccine uptake in this population is far below the goal set by Healthy People 2020. The purpose of this study was to examine predictors of seasonal influenza vaccination among pregnant women.

Methods

Between 2009 and 2012, the Vaccines and Medications in Pregnancy Surveillance System (VAMPSS) conducted a prospective cohort study of influenza vaccine safety among pregnant women in the US and Canada that oversampled vaccinated women. Data for the present paper are from an additional cross-sectional telephone survey completed during the 2010–2011 influenza season. We examined predictors of influenza vaccination, focusing on Health Belief Model (HBM) constructs.

Results

We surveyed 199 pregnant women, 81% of whom had received a seasonal influenza vaccine. Vaccination was more common among women who felt more susceptible to influenza (OR = 1.82, 95% CI 1.10–3.01), who perceived greater vaccine effectiveness (OR = 3.92, 95% CI 1.48–10.43), and whose doctors recommended they have flu shots (OR = 3.06, 95% CI 1.27–7.38). Those who perceived greater barriers of influenza vaccination had lower odds of vaccination (OR = 0.19, 95% CI 0.05–0.75). Perceived social norms, anticipated inaction regret, and worry also predicted uptake, though demographic characteristics of respondents did not.

Conclusion

The HBM provides a valuable framework for exploring influenza vaccination among pregnant women. Our results suggest several potential areas of intervention to improve vaccination rates.     

Acceptation de la vaccination antigrippale par les soignants au sein d’une institution gériatrique et médicosociale

Introduction

Seasonal influenza is a viral transmissible infectious disease causing increased morbidity or mortality in frail subjects, especially those living in institutions. Measures to prevent the impact of infectious diseases were proposed based on the use of influenza vaccination among health-care professionals. We wanted to evaluate the acceptance of our institutional vaccination procedure initiated in 2005 and possible improvement.

Methods

A questionnaire was sent in May 2007 to all health-care professionals (n = 730) to identify their current vaccine status in 2006 and their opinion concerning vaccination against influenza in 2007.

Results

Subsequently, 369 (50.2%) responses were obtained. Amongst those responding, 31.7% were vaccinated in 2006, 77.8% using the institutional procedure. Also, 221 (87.7%) nonvaccinated health-care professionals indicated their position concerning influenza vaccination: 37% of them would accept the vaccination in 2007 (on the condition that our current institutional procedure be improved), 63% of them would refuse influenza vaccines in spite of any improvement.

Conclusion

Our study emphasizes that the use of an adapted procedure for influenza vaccination among health-care professionals could improve vaccine coverage. It also emphasizes that a margin of those professionals are still reluctant to vaccination.     

Interest in having HPV vaccination among adolescent boys in England

Background and purpose

The United States’ Centers for Disease Control and Prevention recommends that boys aged 11–12 be vaccinated against HPV to reduce the risk of genital warts and HPV-related cancers. No recommendation has been made in England although there have been calls to widen access to the vaccine. This study aimed to assess boys’ willingness to have HPV vaccination, eliciting reasons for their decisions.

Methods

528 boys aged 16–18 years completed a questionnaire in school. Measures included demographic characteristics, HPV awareness, willingness to have the vaccine, and reasons for the vaccine decision. Coding of open responses was informed by social cognition model constructs.

Results

A large proportion of the sample (41%) intended to have the vaccine, however, slightly more were unsure (49%) and a small number (10%) would not get vaccinated. Uncertainty was associated with lack of previous awareness of HPV and perceived lack of adequate information. Boys who would not have the vaccine did not feel at risk or did not see the need for it.

Conclusion

These preliminary data suggest that HPV vaccination may be acceptable to boys, and confirm previous findings that information is vital in the decision-making process.     

Provider perceptions of barriers and facilitators of HPV vaccination in a high-risk community

Background

Maximizing HPV vaccine uptake among those at highest risk for cervical cancer is critical. We explored healthcare provider perspectives on factors influencing HPV vaccination among adolescent girls in a community with high cervical cancer rates.

Methods

From March to May 2009, we conducted in-depth interviews with 21 medical staff providing care to adolescent girls at two clinics in Los Angeles, CA, serving a predominantly Hispanic population with high cervical cancer rates. Interviews were recorded and transcribed data were reviewed for coding and thematic content related to potential barriers and facilitators of HPV vaccination.

Results

Providers and medical staff overwhelmingly focused on parental beliefs as barriers to HPV vaccination. Perceived parental misconceptions acting as barriers included the belief that adolescents do not need vaccinations and that no-cost vaccine programs like Vaccines for Children are only available for younger children. Perceived parental concerns that the vaccine will promote sexual activity were prevalent, which prompted providers to frame HPV vaccine as a “routine” vaccine. However, the medical staff felt mothers with a friend or relative supportive of HPV vaccination were more likely to request the vaccine. The staff also noted that for Hispanic parents the “preferred” source of information is peers; if the “right people” in the community were supportive of HPV vaccine, parents were more willing to vaccinate. Other barriers included lack of immunization records among immigrant parents and a difficult-to-reach, mobile clientele.

Conclusions

Providers noted a number of barriers to HPV vaccination, including some perceived parental misconceptions that could be addressed with education about the need for adolescent vaccines and available free vaccine programs. Because community support appears particularly important to Hispanic parents, the use of promotoras – peer liaisons between health organizations and the community – may increase HPV vaccine uptake in this population.     

Health and economic impact of the seasonal influenza vaccination programme in England

Background

The seasonal influenza vaccination programme in England targets individuals over 65 years old and in clinical risk groups.

Methods

A model of influenza transmission and disease was fitted to weekly primary care consultations due to influenza in a typical pre-pandemic season (2006/2007). Different scenarios were constructed about influenza severity and how well vaccines match circulating strains to assess the impact and cost-effectiveness of the current vaccination programme.

Results

A well-matched vaccine may reduce the incidence of laboratory-confirmed influenza illness from 8.2% (95% range 4.3–13%) to 5.9% (95% range 2.9–9.7%), with 56–73% of this due to indirect protection. The programme is likely to be cost-effective unless both low severity and poor matching is assumed.

Conclusion

The current seasonal influenza vaccination programme appears to substantially reduce disease burden and provides good value for money.     

Risk of febrile convulsions after MMRV vaccination in comparison to MMR or MMR+V vaccination

Background

In July 2006, Priorix-Tetra™, a combined measles-mumps-rubella-varicella (MMRV) vaccine, was licensed in Germany. Since a postlicensure study had shown a more than twofold elevated risk of febrile convulsions (FC) after first dose vaccination with the combined MMRV vaccine ProQuad^® compared to separately administered MMR and V vaccines (MMR+V), the Paul-Ehrlich-Institute, the German regulatory agency for vaccine licensing and safety, requested a study investigating the risk of FC for Priorix-Tetra™.

Methods

We performed a matched cohort study based on claims data of more than 17 million insurees in the German Pharmacoepidemiological Research Database. All children born between 01.01.2004 and 31.12.2008 who received a 1st dose of MMRV vaccine were matched to children vaccinated with MMR, MMR+V and MMR or MMR+V (combined group), respectively, by sex, age, month of vaccination and statutory health insurance. The primary outcome was defined as hospitalization with a diagnosis of FC without any alternative plausible cause of FC, e.g. an infection or neurological condition, coded as main discharge diagnosis. The secondary outcome excluded only neurological conditions to provide a more comparable outcome definition to the one used in the ProQuad^® study. Numbers needed to harm (NNH), risk ratios and confounder adjusted odds ratios (ORs) with 95% CIs were estimated to compare the exposure groups.

Results

In the main risk period 5–12 days after immunization, the adjusted ORs of the primary endpoint for immunization with MMRV vaccine relative to the comparator vaccine indicated in brackets were 4.1 [95% CI 1.3–12.7; MMR], 3.5 [0.7–19.0; MMR+V], and 4.1 [1.5–11.1; MMR and MMR+V]. The corresponding ORs for the secondary outcome were 2.3 [1.4–3.9; MMR], 1.5 [0.8–2.9; MMR+V] and 2.4 [1.5–3.9; MMR and MMR+V].

Conclusions

This study in children younger than 5 years, 90% of them between 11 and 23 months, shows a risk of FC similar in magnitude for Priorix-Tetra™ as has previously been reported for ProQuad^® suggesting a class effect for these quadrivalent vaccines.     

Are immunosuppressive medications associated with decreased responses to routine immunizations? A systematic review

Background

Long-term immunosuppressive medications are being used more commonly for a variety of medical conditions, including immune-mediated diseases and organ transplantation. While these medications are often necessary, they are associated with an increased risk of serious infections. Vaccination may be a way to prevent a variety of infections but vaccine responses among patients receiving immunosuppressive therapies have been variable.

Purpose

To systematically review the literature describing immune responses among patients on immunosuppressive therapies to vaccinations including influenza, pneumococcal, meningococcal, hepatitis A and B, tetanus toxoid, pertussis, varicella, and zoster.

Data sources

English language citations in the MEDLINE and EMBASE databases from 1985 to 2010.

Study selection

Two reviewers independently screened titles and abstracts to identify prospective, controlled studies reporting pre- and post-vaccination titers of recommended vaccines in patients receiving long-term immunosuppressive therapies for full-text review.

Data extraction

Three reviewers independently assessed study characteristics including treatment regimens and pre- and post-vaccination titers.

Data synthesis

Of the 972 identified titles, fifteen met inclusion criteria. Ten studies assessed the effects of immunosuppressive medications on responses to influenza vaccine, four studies investigated responses following pneumococcal vaccination, and one study assessed both influenza and pneumococcal vaccination. Five of the studies that evaluated influenza vaccination showed partially diminished responses among individuals receiving immunosuppressive therapies, while one of the pneumococcal vaccine studies showed significantly decreased responses following vaccination. Patients treated with more than one immunosuppressive medication were the least likely to respond to vaccination.

Limitations

The heterogeneity of reported outcomes limits generalizeability.

Conclusions

Immunosuppressive therapy, particularly combination regimens, may blunt response to influenza and pneumococcal vaccinations. To ensure the best chance of response, immunizations should be administered prior to initiation of immunosuppressive medications whenever possible.     

Vaccination of adults 65 years of age and older with tetanus toxoid, reduced diphtheria toxoid and acellular pertussis vaccine (Boostrix(®)): results of two randomized trials

Background

Pertussis can cause significant morbidity in elderly patients, who can also transmit this disease to infants and young children. There is little data available on the use of acellular pertussis vaccines in recipients ≥65 years of age.

Methods

Two studies examined the safety and immunogenicity of tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (Tdap) vaccine (Boostrix^®) in healthy ≥65 year olds. In Study A subjects received single doses of Tdap and seasonal influenza vaccine either co-administered or given one month apart. In Study B subjects received either Tdap or tetanus-diphtheria (Td) vaccine. Antibodies were measured before and one month after vaccination. Reactogenicity and safety were actively assessed using diary cards.

Results

A total of 1104 subjects 65 years of age and older received a Tdap vaccination in the two studies. In study A, no differences in immune responses to Tdap or influenza vaccine were observed between co-administered or sequentially administered vaccines. In study B, Tdap was non-inferior to Td with respect to diphtheria and tetanus seroprotection, and anti-pertussis GMCs were non-inferior to those observed in infants following a 3-dose diphtheria, tetanus and acellular pertussis (DTaP) primary vaccination series, in whom efficacy against pertussis was demonstrated. Reports of adverse events were similar between Tdap and Td groups.

Conclusions

Tdap was found to be immunogenic in subjects ≥65 years, with a safety profile comparable to US-licensed Td vaccine. Tdap and influenza vaccine may be co-administered without compromise of either the reactogenicity or immunogenicity profiles of the two vaccines.     

Qualitative evaluation of Rhode Island's healthcare worker influenza vaccination regulations

Objective

To evaluate Rhode Island's revised vaccination regulations requiring healthcare workers (HCWs) to receive annual influenza vaccination or wear a mask during patient care when influenza is widespread.

Design

Semi-structured telephone interviews conducted in a random sample of healthcare facilities.

Setting

Rhode Island healthcare facilities covered by the HCW regulations, including hospitals, nursing homes, community health centers, nursing service agencies, and home nursing care providers.Participants Staff responsible for collecting and/or reporting facility-level HCW influenza vaccination data to comply with Rhode Island HCW regulations.

Methods

Interviews were transcribed and individually coded by interviewers to identify themes; consensus on coding differences was reached through discussion. Common themes and illustrative quotes are presented.

Results

Many facilities perceived the revised regulations as extending their existing influenza vaccination policies and practices. Despite variations in implementation, nearly all facilities implemented policies that complied with the minimum requirements of the regulations. The primary barrier to implementing the HCW regulations was enforcement of masking among unvaccinated HCWs, which required timely tracking of vaccination status and additional time and effort by supervisors. Factors facilitating implementation included early and regular communication from the state health department and facilities’ ability to adapt existing influenza vaccination programs to incorporate provisions of the revised regulations.

Conclusions

Overall, facilities successfully implemented the revised HCW regulations during the 2012–2013 influenza season. Continued maintenance of the regulations is likely to reduce transmission of influenza and resulting morbidity and mortality in Rhode Island's healthcare facilities.     

Risk factors of underutilization of childhood immunizations in ultraorthodox Jewish communities in Israel despite high access to health care services

Background

The risk factors of underutilization of childhood vaccines in populations with high access to health services are not fully understood.

Objectives

To determine vaccination coverage and factors associated with underutilization of childhood vaccines in a population with sub-optimal vaccination compliance, despite a high health care access.

Methods

The study was conducted among 430 children from ultraorthodox Jewish communities in the Bnei Brak city and Jerusalem district. Data on immunization status, socio-demographic factors and on parents’ attitudes regarding vaccines were obtained from medical records and through parents’ interviews.

Results

The proportion of fully vaccinated children was 65% in 2- to 5-year-old ultraorthodox children from Jerusalem district, and 86% in 2.5-year-old children from Bnei Brak city. The factors that were significantly associated with vaccines underutilization in Bnei Brak were having >6 siblings, maternal academic education, parental religious beliefs against vaccination, perceived risk of vaccine preventable diseases as low, and mistrust in the Ministry of Health (MOH). Similarly, in Jerusalem, religious beliefs against vaccination, and the perceived low risk of vaccine preventable diseases significantly increased the likelihood of under-immunization, while having a complementary health insurance was inversely related with vaccines underutilization.

Conclusions

The risk factors of under-immunization are in part modifiable, by means of health education on the risks of vaccine preventable diseases and by improving the trust in the MOH. The leaders of the ultraorthodox communities could play an important role in such interventions.