Knowledge and attitude of pregnant women toward flu vaccination: a cross-sectional survey

Objective: The study was conducted to explore the knowledge of pregnant women about influenza, influenza vaccine during pregnancy and the attitudes regarding immunization.

Methods: A questionnaire based on the model proposed by Yudin in 2009 was translated, adapted and administered to 309 pregnant women in the third trimester of pregnancy between October 1 and December 1, 2013 at San Giovanni Calibita Fatebenefratelli hospital of Rome (Italy).

Results: Most of the interviewed women (68.9%) answered that influenza is highly contagious, 34.6% of them believed that pregnant women have the same risk of complications as non-pregnant women. Only 5.8% were aware that the vaccine is recommended for women in the second and third trimester of pregnancy and only 14.2% of women answered that the vaccine is safe during pregnancy. Only 3/309 women reported recommendation and offer of vaccination during current pregnancy, but none of them was vaccinated.

Conclusions: Overall, knowledge regarding influenza, implications during pregnancy and influenza vaccine was poor among pregnant women. In Italy, the National Vaccine Prevention Plan 2012–2014 recommends influenza vaccine during pregnancy, but only 18/309 were aware of this recommendation. These results suggest that in order to increase influenza vaccine acceptance it is necessary to improve pregnant women knowledge about influenza and to offer education to healthcare providers.     

Vaccines for pertussis and influenza: recommendations for use in pregnancy

The active immunization of pregnant women during pregnancy to protect them from disease and protect their neonate with passive antibodies is a biologic fact. Fortunately, many infectious diseases occur infrequently due to excellent pediatric vaccine programs. However, most adults and many physicians are unaware of the risks of not administering vaccines especially to pregnant women. Influenza vaccine (trivalent inactivated influenza vaccine) is recommended by (Advisory Committee on Immunization Practices (ACIP) for pregnant women in any trimester of pregnancy and Tetanus, reduced diphtheria, and pertussis (TdaP) vaccine is recommended by the ACIP to be given before pregnancy, during pregnancy, or in the immediate postpartum period. Only 2% of the adult US population is protected against pertussis and it is estimated that only 25% of pregnant women receive influenza vaccine during the influenza season. This chapter discusses trivalent inactivated influenza vaccine and TdaP use during pregnancy, the diseases they prevent, and the benefit to the neonate.     

Vaccination Against Influenza in Pregnancy: A Survey of Canadian Maternity Care Providers

Objective

Influenza vaccine uptake among Canadian pregnant individuals is suboptimal. Failure to incorporate vaccination into routine prenatal care and a lack of recommendations from healthcare providers are recognized as barriers to vaccination. The aim of this study was to assess Canadian maternity care providers’ knowledge, attitudes, and practices regarding influenza vaccination in pregnancy.

Viral respiratory disease in pregnancy

PURPOSE OF REVIEW: Recently there has been an increased concern over viral respiratory infections and their potential for a pandemic. This concern makes it important to review the most current guidelines for the management of viral respiratory diseases in pregnancy. RECENT FINDINGS: The topics covered are influenza, avian influenza, and severe acute respiratory syndrome. SUMMARY: Pregnant women have an increased susceptibility to viral respiratory diseases. The most common respiratory virus to infect pregnant women is influenza. All women who intend to become pregnant or are pregnant should receive the influenza vaccine. If a pregnant woman develops influenza she should be treated with supportive care. Antiviral medications should be reserved for cases where the benefits outweigh the risks. Avian influenza (H5N1) is a new emerging virus usually contracted from direct contact with diseased birds. There is no commercially available vaccine at this time to prevent infection. Pregnant women should be treated aggressively with supportive care and antiviral medications, as the significant risk of maternal mortality outweighs the potential fetal risks. Pregnant women diagnosed clinically with severe acute respiratory syndrome should be treated empirically, as a serologic diagnosis can take weeks to confirm. The treatment of pregnant women with severe acute respiratory syndrome should be without ribavirin.     

Oseltamivir for influenza in pregnancy

Pregnancy predisposes women to disproportionate morbidity and mortality from influenza infections. This is true for both seasonal epidemics as well as occasional pandemics. Inactivated yearly influenza vaccines are the best available method of disease prevention and are recommended for all pregnant women in any trimester of pregnancy and postpartum. Oseltamivir (Tamiflu^®) is currently the first-line recommended and most commonly used pharmaceutical agent for influenza prophylaxis and treatment. Oseltamivir has been demonstrated to prevent disease among exposed individuals, as well as to shorten the duration of illness and lessen the likelihood of complications among those infected. The physiologic adaptations of pregnancy may alter the pharmacokinetics and pharmacodynamics of this important drug. Updated evidence regarding these potential alterations, current knowledge gaps, and future investigative directions is discussed.     

Travel-Related Infections Among Pregnant Travellers to the Tropics: An Overview

Infectious diseases acquired during travel pose a significant health risk to pregnant travellers, who are more susceptible to both acquiring certain infections and developing severe complications. A review of the literature focusing on recent evidence-based guidelines was conducted with attention to tropical infections in the pregnant patient. A summary meant to serve as a succinct reference for health care professionals caring for pregnant women is presented. Magnitude of risk, clinical features, management, and preventive strategies of major travel-acquired infections of pertinence to the pregnant traveller are summarized, including malaria, arboviral infections, foodborne infections, helminthic infections, and influenza. Tables with details on specific infections within each group and guidance for reducing travel-related health risks in the pregnant patient are presented.     

Influenza Vaccine Programs and Pregnancy: New Canadian Evidence for Immunization

Among healthy pregnant women, excess deaths due to influenza were documented during pandemics, but the impact of influenza on pregnant women in non-pandemic years is not clear. In Canada, influenza immunization is recommended for pregnant women only if they have comorbidities known to place them at increased risk of complications or if they deliver during influenza season, therefore becoming a contact of a high-risk infant. The National Advisory Committee on Immunization has indicated that additional evidence, relevant to healthy pregnant Canadian women, is needed to support a recommendation for influenza immunization for all pregnant women. In this commentary we summarize new Canadian data supporting universal influenza immunization for pregnant women and discuss ways in which the Society of Obstetricians and Gynaecologists of Canada might take a leadership role in making influenza vaccination in pregnancy a priority to decrease influenza morbidity in pregnant Canadian women.     

Maternal morbidity and perinatal outcomes among pregnant women with respiratory hospitalizations during influenza season

OBJECTIVES: A population-based assessment of maternal and perinatal morbidity related to respiratory illness during influenza season among pregnant women has not been published. The objectives of this investigation were to describe and quantify the impact of respiratory hospitalization during pregnancy on serious maternal and perinatal morbidity. STUDY DESIGN: A matched cohort study using an administrative database of pregnant women enrolled in the Tennessee Medicaid population to determine pregnancy outcomes associated with respiratory hospitalizations during influenza season. Pregnant women aged 15 to 44 years with a respiratory hospitalization during influenza seasons 1985-1993 were matched by gestational age and presence of comorbidity with pregnant control subjects without a respiratory hospitalization. RESULTS: During the eight influenza seasons studied, 293 women with singleton pregnancies had respiratory disease hospitalizations (5.1:1000). Women with asthma had high rates of such hospitalization (59.7:1000). Compared with matched controls, women with respiratory hospitalizations had similar modes of delivery, delivery length of stay, and episodes of preterm labor. The prevalence of prematurity and low birth weight among infants born to such women was likewise similar between the two groups. CONCLUSION: In this population of pregnant women, those with asthma accounted for half of all respiratory-related hospitalizations during influenza seasons, with 6% of pregnant women with asthma requiring respiratory hospitalization during influenza season, (odds ratio 10.63, 95% CI, 8.18-13.83, compared with women without a medical comorbidity). We detected no significant increase in adverse perinatal outcomes associated with respiratory hospitalizations during influenza season.     

Pregnant Women’s Knowledge of Influenza and the Use and Safety of the Influenza Vaccine During Pregnancy

IntroductionWe wished to assess pregnant women’s knowledge of influenza, vaccine safety during pregnancy and breast feeding, and the recommendations for use of the influenza vaccine in pregnancy.MethodsWe performed a cross-sectional survey of postpartum women during influenza season in 2006.ResultsPregnant women’s overall knowledge of these subjects was poor. Most women (95%) knew that influenza is highly contagious, but almost 90% incorrectly believed that pregnant women have the same risk of complications as non-pregnant women. Only one half of the women were aware of national recommendations for vaccination during pregnancy and that the vaccine is safe during pregnancy and breast feeding, and 80% incorrectly believed that the vaccine can cause birth defects. Only 20% of women had been offered the vaccine during the current pregnancy or a prior pregnancy.ConclusionsPregnant women’s knowledge about influenza vaccine recommendations and safety during pregnancy is poor. There is substantial room for improvement among prenatal care providers in both patient education and offering the vaccine.     

Influenza and tetanus, diphtheria, and acellular pertussis vaccinations during pregnancy

Vaccinations in pregnancy are an important aspect of prenatal care and of improving not only maternal health but also neonatal outcomes. Only 2 vaccines are specifically recommended during pregnancy: influenza and tetanus, diphtheria, and acellular pertussis (Tdap). Because influenza illness disproportionately affects pregnant women compared with other populations, annual prevention of influenza illness is recommended for all women who will be pregnant during influenza season (October to May). Influenza vaccination has been recently reported to also result in decreased febrile respiratory illnesses in the newborn, likely through passive antibody transfer. Pertussis infection rates are rising in the United States as vaccine-induced immunity wanes, with the mortality burden primarily seen in infants aged <6 months. Pertussis immunization with Tdap is now recommended for all pregnant women during the late second (>20 weeks) or third trimester with the intent to both protect the pregnant woman and provide passive antibody to the infant before vaccination at 2 months of age. Provider support for these recommendations regarding both annual influenza vaccination and postpartum Tdap vaccination during pregnancy is critical to ensuring vaccine delivery and improving both maternal and fetal health. The article reviews the epidemiology and clinical aspects of influenza and pertussis infection with particular attention to pregnancy and recommendations for vaccination in these women. TARGET AUDIENCE: Obstetricians and gynecologists, ophthalmologists, neurologists, family physicians, emergency room physicians LEARNING OBJECTIVES: After completing this CME activity, obstetricians and gynecologists should be better able to analyze how influenza infection disproportionally affects pregnant women. Assess how influenza vaccination improves maternal and likely neonatal outcomes. Evaluate pertussis infection and immunity in adults, and counsel pregnant women as to the benefits of Tdap vaccination, particularly for the infant.     

Pandemic H1N1 2009 (swine flu) and pregnancy

H1N1 pandemic influenza is a novel strain of the influenza A virus. It is widely known as swine flu. Most people affected by the virus, including pregnant women, suffer a mild viral illness, and make a full recovery. The median duration of illness is around seven days. This influenza typically affects the younger age group i.e. from the ages of 5–65 years but the age groups of below 5 years and above 65 are particularly prone to severe complications. Pregnant women, because of their altered immunity and physiological adaptations, are at higher risk of developing pulmonary complications, especially in the third trimester. Antiviral drugs are effective against the virus and are not contraindicated in pregnancy and breastfeeding. Vaccines have now been developed and are offered to pregnant women. Safety issues have been examined by regulatory authorities and the vaccines have been determined to be safe for administration in all trimesters of pregnancy.     

Influenza vaccination during pregnancy. Patients' and physicians' attitudes.

OBJECTIVE: To identify potentially remediable attitudinal factors among women and their physicians that may present barriers to influenza vaccination during pregnancy. STUDY DESIGN: We conducted a prospective survey study administered concurrently during influenza season (January-March 2000) to postpartum women in an urban, high-volume medical center and to practicing obstetricians in the metropolitan Los Angeles area. Analyses focused on individual questions' relation to the outcomes of: (1) patients' receipt of influenza vaccine during the recently completed pregnancy, and (2) physicians' discussion of influenza vaccine with their pregnant patients. RESULTS: Surveys were completed by 242 postpartum women and 113 physicians. Among the women, 22% had discussed influenza vaccine with their physicians during pregnancy, with only 8% of respondents having been vaccinated. Significantly more physicians stated that they discussed vaccination with their patients than did women (74% vs. 22%; P < .001). Physicians were more likely to recommend vaccine if they were aware of current Centers for Disease Prevention and Control guidelines (RR = 2.6, 1.1-5.9), gave vaccinations in their offices (RR = 1.2, 1.01-1.4) and had been vaccinated against influenza themselves (RR = 1.9, 1.3-2.8). CONCLUSION: Influenza vaccination during pregnancy occurred infrequently in this study cohort, and a significant discrepancy was seen between patients' and physicians' impressions of whether its use or recommendation had been discussed. Gaps existed in both groups' understanding of potential benefits of influenza vaccine for both pregnant women and their newborns. The survey results suggest potential strategies for targeting improved educational programs for physicians and patients to improve influenza vaccination rates for pregnant women.     

Hospitalizations with respiratory illness among pregnant women during influenza season

OBJECTIVE: To examine hospitalizations with respiratory illness among pregnant women in the United States during periods of influenza activity. METHODS: Data were obtained from the Healthcare Cost and Utilization Project National Inpatient Sample (NIS), the largest publicly available all-payer hospital discharge database. Hospitalizations for respiratory illness and pregnancy were classified with International Classification of Diseases, 9th Revision, Clinical Modification codes. Analyses were stratified by delivery status. Discharge characteristics, length of stay, and complications of delivery among hospitalized pregnant women with and those without respiratory illness were compared. RESULTS: During the 1998-2002 influenza seasons, 3.4 per 1,000 hospitalizations of pregnant women included diagnoses of respiratory illness. Characteristics of pregnancy hospitalizations associated with higher odds of respiratory illness were presence of a high-risk condition for which influenza vaccination is recommended (adjusted odds ratio [OR] 3.2, 95% confidence interval [CI] 3.0-3.5 and OR 6.0, 95% CI 5.2-6.9 for nondelivery and delivery, respectively), Medicaid/Medicare as primary expected payer of care (OR 1.2, 95% CI 1.1-1.3 and OR 1.9, 95% CI 1.7-2.2 for nondelivery and delivery, respectively), and hospitalization in a rural area (OR 1.2, 95% CI 1.1-1.4 for nondelivery). During influenza season, hospitalized pregnant women with respiratory illness had significantly longer lengths of stay and higher odds of delivery complications than hospitalized pregnant women without respiratory illness. CONCLUSION: Hospitalizations with respiratory illness among pregnant women during influenza season are associated with increased burden for patients and the health care system. Intervention efforts to decrease influenza-related respiratory morbidity among pregnant women should be encouraged. LEVEL OF EVIDENCE: III.     

孕产妇合并甲型H1N1流感对母儿结局的影响

目的 探讨孕产妇合并甲型H1N1流感(简称甲流)对母儿结局的影响及产科处理.方法 收集2009年11月7日至2009年12月15日中国医科大学附属盛京医院收治的19例合并甲流的孕产妇资料,回顾性分析甲流对母儿的影响. 结果 19例患者中,产褥期妇女3例,占15.8%,均为轻症,愈后良好.孕期患者16例,占84.2%,其中早期妊娠2例(12.5%),中期妊娠7例(43.8%),晚期妊娠7例(43.8%).16例孕期患者按病情严重程度分,轻症6例(37.5%),重症2例(12.5%),危重症8例(50.0%).2例早期妊娠患者均为轻症,甲流治愈后选择人工流产;中期妊娠的4例轻症患者甲流治愈后足月分娩,3例重症及危重症患者中1例甲流治愈后足月分娩,1例孕27周胎死宫内和1例孕23周因孕妇发生严重并发症,均行剖宫取胎术,后者胎儿娩出后死亡;妊娠晚期的7例均为重症及危重症患者,均行急诊剖宫产术终止妊娠,2例胎儿孕晚期胎死宫内,余5例存活,包括4例早产儿和1例足月儿.行急诊剖宫产手术的全部9例(56.3%,9/16)重症及危重症孕妇中,活产新生儿6例,存活的5例均未感染甲流;2例孕产妇术后死亡(10.5%,2/19). 结论妊娠晚期孕妇感染甲流极易发展为重症及危重症,及时终止妊娠是挽救母儿生命又使新生儿避免甲流病毒感染的有效方法之一.     

Acceptability of maternal immunization against influenza: the critical role of obstetricians

Introduction: Pregnant women and infants are at increased risk of vaccine-preventable complications due to influenza. In Switzerland, immunization was first recommended to all pregnant women in 2009. We assessed the acceptability of this recommendation and its determinants two seasons later. Methods: Women having delivered in the University Hospitals of Geneva during March 2011 were asked to fill in a questionnaire assessing their knowledge, beliefs and acceptability of influenza vaccination during pregnancy. Results: The questionnaire was completed by 261/323 (80%) women. Out of 261, 213 (82%) were aware of increased risks of influenza during pregnancy, and 119/261 (46%) knew that immunization was recommended during pregnancy. Only 110/261 (42%) recalled an immunization advise during their pregnancy and only 47/261 (18%) had been immunized. A direct recommendation was the main predictor of immunization, associated with a 107-fold increased likelihood of vaccination. Factors identified by multivariate analyses as independently associated with the likelihood of immunization were to have been recommended immunization by a private (OR 9.1) or hospital (OR 4.7) obstetrician rather than a midwife, to have no fear that immunization could cause preterm delivery (OR 0.3) and to have been immunized in previous years (OR 10.7). Conclusion: Two years after the recommendation of influenza immunization during pregnancy, most post-partum women recalled being neither recommended nor adequately informed about influenza vaccine and its safety. This identifies major gaps in awareness and/or communication in healthcare workers and suggests that improving immunization safety/efficacy awareness among obstetricians as the most likely method to improve flu immunization during pregnancy.     

妊娠合并甲型H1N1流感14例临床分析

目的:探讨妊娠合并甲型H1N1流感的临床特点、治疗及其结局.方法:对2009年11月2日至2009年12月2日我院救治的14例妊娠期感染H1N1流感孕妇的临床情况进行总结性分析.结果:14例孕妇住院3～21天,平均8.6天.4例继续妊娠,7例手术结束妊娠,1例引产,2例自娩.13例新生儿存活,1例死亡,存活新生儿中5例早产,无新生儿H1N1感染病例,无孕妇死亡病例.结论:妊娠期感染H1N1流感孕妇更容易出现呼吸困难症状,病理妊娠及妊娠合并内科疾病者更易成为危重症病例.而早期应用奥司他韦能有效促进病情恢复,并未发现有母儿不良结局.     

Influenza vaccination during pregnancy and factors for lacking compliance with current CDC guidelines

Background.?The Center for Disease Control and Prevention (CDC) and the American College of Obstetricians and Gynecologists (ACOG) recommend influenza vaccination for all pregnant women during the influenza season. However, the actual rate of vaccination is substantially below the target levels. Given the recent emergence of novel influenza strains, there is an important need to address knowledge gaps in women and their healthcare providers to improve vaccination coverage for pregnant women during inter-pandemic and pandemic periods. This study attempted to identify potentially remediable attitudinal factors among women and their physicians that may present barriers to influenza vaccination and then assess the impact of interventions to increase the influenza vaccination rate in pregnant women.

Methods.?This prospective study initially analyzed patient and physician knowledge regarding the influenza vaccine in pregnancy and then examined the impact of several interventions aimed to increase immunization rates implemented over the following year. Influenza vaccination rates were assessed before and after the interventions.

Results.?Five hundred twenty patients were enrolled in the study during the influenza season 2007/2008. Only 19% of those patients reported receiving the influenza vaccination and only 28% recalled that the vaccine was offered. Following this, in the summer and fall of 2008, we performed a physician education program and distributed posters advertising the influenza vaccine to all offices offering prenatal care in our area in order to increase patient awareness of the need for the vaccine. In the following influenza season, we again reassessed the vaccination rate and patient's knowledge and awareness of the vaccine in 480 postpartum women. Influenza vaccination rates increased from 19% to 31%. After the intervention, 51% of patients recalled that the vaccine was offered to them during the pregnancy as opposed to only 28% the year prior.

Conclusion.?Understanding the specific barriers to vaccination that our population faced was helpful in designing the interventions to improve knowledge and acceptance of influenza vaccination in pregnancy, which led to an increased vaccination rates in women.     

妊娠期流感病毒感染特点与母儿不良结局

孕产妇合并H1N1、H5N1流感病毒感染常可导致不良妊娠结局。采用流感病毒疫苗,在流行季节早期筛查、早期诊断,采用抗病毒药物早期治疗,妊娠期严密监护、多学科处理可改善母儿结局。     

Influenza-Attributed Hospitalization Rates Among Pregnant Women in Canada 1994–2000

BackgroundAlthough it is recommended that pregnant women at risk for influenza complications receive influenza vaccine, it is not clear if healthy pregnant women are at increased risk for adverse outcomes. We aimed to estimate the rate of hospitalization attributable to influenza for healthy pregnant women and for those with known co-morbidities.MethodsHospital admission records of women admitted from 1994 to 2000 with a respiratory condition during pregnancy were extracted from the hospitalization database (Canadian Institute of Health Information). Admissions for childbirth were excluded. Weekly admissions, stratified by the presence of co-morbid conditions, were modelled as a function of viral activity, seasonality, trend, and holiday effects using Poisson regression with proxies for influenza and other viral activity developed previously for similar age-specific models of influenza-attributed hospital admissions.ResultsApproximately 300 hospitalizations of pregnant women per year were attributed to influenza, of which 140 were in women with co-morbidities. This hospitalization rate corresponds to 150 (95% CI 140–170) hospitalizations per 100 000 pregnant women per year. An estimated 1 in 1000 healthy pregnant women were hospitalized due to influenza per year. Asthma was the most important risk factor, accounting for an estimated 450 (95% CI 300–600) admissions per 100 000 pregnant women. Admission rates in pregnant women were relatively constant across multiple influenza seasons of varying severity among older adults. During the four weeks of peak influenza activity, 60% of respiratory-related admissions of otherwise healthy pregnant women could be attributed to influenza.ConclusionHealthy pregnant Canadian women have consistently higher rates of hospital admission attributable to influenza infection than their non-pregnant peers. The admission rate for healthy pregnant women corresponds to the rate for men and women aged 65 to 69 years, which suggests that this population may benefit from annual influenza immunization.