An outbreak of influenza A in a nursing home.

An outbreak of influenza A occurred in an elderly population in a Maryland nursing home between December 8, 1980 and January 13, 1981 and involved 76 of the 170 residents. Throat swabs from two of 10 acutely ill residents yielded influenza A virus similar to the A/Taiwan/1/79 strain. Fourfold or greater increases in the titer of complement-fixing (CF) or hemagglutination-inhibiting (HI) antibodies were detected in paired sera from four of five ill residents and from none of four well residents. One hundred (62.9 per cent) of 159 residents with known vaccination histories had been vaccinated with trivalent influenza virus vaccine in October and November 1980. Crude illness attack rates and mortality rates were similar in vaccinees and nonvaccinees. Various risk factors and hypotheses were examined in an attempt to explain the apparent lack of vaccine efficacy.     

Zanamivir use during transmission of amantadine-resistant influenza A in a nursing home.

OBJECTIVE: To describe the use of zanamivir during an influenza A outbreak. POPULATION: Residents of a 176-bed long-term-care facility for the elderly in Newmarket, Ontario, Canada, 90% of whom received influenza vaccine in the fall of 1998. OUTBREAK: When respiratory illness due to influenza A was confirmed, infection control measures and amantadine prophylaxis were initiated. Despite these measures, transmission of influenza A continued. INTERVENTION: Zanamivir inhalations, 10 mg daily for prophylaxis and 10 mg twice daily for treatment of influenza. RESULTS: There were 13 definite and 66 probable outbreak-associated cases of influenza A. Twelve (15%) cases developed pneumonia, 7 (9%) were hospitalized, and 2 (2.6%) died. All 12 culture-positive cases yielded influenza A/Sydney/H3N2/05/97-like virus, a 1998/99 vaccine component. The three isolates obtained prior to the initiation of amantadine were amantadine-susceptible; all nine obtained after prophylaxis was instituted were amantadine-resistant. One hundred twenty-nine (92%) of 140 residents who were offered zanamivir accepted it and were able to attempt inhalations. Of these 129, 78% (100) had no difficulty in complying with inhalations. Difficulty with inhalations was associated with decreased functional and mental status. Fifteen (58%) of 26 residents fully dependent in activities of daily living had difficulty compared to 14 (14%) of 100 others (P<.001). Twenty-two (45%) of 49 residents not oriented to person, place, or time had difficulty compared to 7 (10%) of 77 others (P<.001). In the 2 weeks after zanamivir prophylaxis, only 2 new cases of respiratory illness occurred, neither confirmed as influenza. No side effects were identified in 128 zanamivir-treated residents. CONCLUSION: A minority of nursing home residents have difficulty following instructions for zanamivir inhalations. Zanamivir was well tolerated, and its use was temporally associated with termination of an outbreak that amantadine had failed to control.     

Delays in the application of outbreak control prophylaxis for influenza A in a nursing home.

OBJECTIVE: To identify delayed prophylaxis from a pre-existing database and strategies to improve performance. SETTING: A skilled nursing facility with 14 floors (4 buildings). The "outbreak unit" was a 50- to 60-bed floor. METHODS: We performed surveillance during six seasons using one protocol. Prophylaxis was started when influenza was cultured in the building and 10% of residents on the floor had a new respiratory illness within 7 days. We defined delayed prophylaxis as four or more residents on a floor with positive cultures whose specimens had been collected within 5 days before the application of prophylaxis. RESULTS: We identified 14 examples of delayed prophylaxis. In three, delayed prophylaxis was related to the 3.9-day delay between culture collection and culture report There was a high degree of commonality among building attack rates within a season. During six seasons, the first case in the last building occurred 27 to 64 days after the first case in the facility. The two seasons with the greatest activity (68 and 154 cases, respectively) began with explosive, multi-floor outbreaks in a single building. The match between the circulating strain and the vaccine was good, except in 1997-1998 when there were seven examples of delayed prophylaxis. CONCLUSIONS: Influenza may involve buildings sequentially with a commonality of building attack rates. Explosive, multi-floor outbreaks early in the season could lead to a lower threshold for prophylaxis within a larger area when initial cases are encountered later in the season. This strategy could have prevented five examples of delayed prophylaxis. Rapid testing of multiple specimens while waiting for culture confirmation could have prevented three examples of delayed prophylaxis.     

Risk factors for mortality from lower respiratory infections in nursing home patients.

BACKGROUND. Little is known about the factors that predict whether nursing home residents with lower respiratory infection (LRI) will do well or poorly, although this information is critically important when making treatment decisions. METHODS. Using nursing home and hospital medical records, we performed a case-control study to identify risk factors for death from LRI among residents of a 110-bed, midwestern community nursing home. Three experienced geriatricians aided in the development of an operational definition of an LRI. In a 3 1/2-year period, we identified 26 cases in which the patients died from LRI and 66 control episodes in which the patients recovered from LRI. RESULTS. Compared with those who survived, those who died were 14 times more likely to be totally dependent with respect to activities of daily living (ADL) than the group of patients least ALD-dependent (odds ratio [OR] = 14; 95% confidence interval [95% CI] = 2.85 to 68.87). After adjusting for ADL, mortality was significantly decreased when a broad-spectrum oral antibiotic (trimethoprim-sulfamethoxazole, cefaclor, amoxicillin-clavulanate, or ciprofloxacin) was used as the initial therapy (OR = .14; 95% CI = .02 to .81). CONCLUSIONS. Better functional status and initial therapy with broad-spectrum oral antibiotics were strong predictors of surviving an LRI in this population of nursing home patients. The antibiotic effect may be a treatment effect or the consequence of underlying factors leading physicians to select particular antibiotics; however, it appears possible to identify low-risk persons who do not require the aggressive treatment and hospitalization that is often recommended for these patients. An approach to the treatment of nursing home LRI is suggested.     

Risk factors for outbreaks of influenza in nursing homes. A case-control study

To determine risk factors for outbreaks of influenza virus infections in chronic-care facilities for the elderly, the authors compared the characteristics of two groups of nursing homes in Genesee County, Michigan, in 1982-1983, following a community-wide epidemic caused by A/Bangkok/1/79-like (H3N2) viruses: seven homes in which an outbreak occurred (case homes) and six homes with sporadic illnesses only (control homes). The two groups were similar in many respects, including the physical characteristics of the facilities, visitation and staffing patterns, infection control practices, and demographic and clinical profiles of residents. Case homes, however, had larger resident populations than control homes (median 160 vs. 92, respectively; p = 0.028) and a lower proportion of residents who had been vaccinated with A/Bangkok antigen the previous autumn (median 51% vs. 81%, respectively; p = 0.047). Based on a retrospectively determined estimate of the efficacy of influenza vaccine in preventing illness (43%), the number of residents presumed to be susceptible to the epidemic strain was higher in case homes than in control homes (median 102 vs. 61, respectively; p = 0.0047) and was the most important factor selected by a stepwise, multivariate logistic regression model (p less than 0.0005). These findings are consistent with mathematical models of vaccine-induced herd immunity in closed populations and suggest that high rates of vaccination can reduce the risk of influenza outbreaks in this setting.     

Concurrent summer influenza and pertussis outbreaks in a nursing home in Sydney, Australia.

OBJECTIVE: To report on the investigation of a summer outbreak of acute respiratory illness among residents of a Sydney nursing home. DESIGN: An epidemiologic and microbiological investigation of the resident cohort at the time of the outbreak and medical record review 5 months later. SETTING: A nursing home located in Sydney, Australia, during February to July 1999. PATIENTS: The cohort of residents present in the nursing home at the time of the outbreak. INTERVENTIONS: Public health interventions included recommendations regarding hygiene, cohorting of residents and staff, closure to further admissions, and prompt reporting of illness; and virologic and serologic studies of residents. RESULTS: Of the 69 residents (mean age, 85.1 years), 35 fulfilled the case definition of acute respiratory illness. Influenza A infection was confirmed in 19 residents, and phylogenetic analysis of the resulting isolate, designated H3N2 A/Sydney/203/99, showed that it differed from strains isolated in eastern Australia during the same period. Serologic evidence of Bordetella infection was also found in 10 residents; however, stratified epidemiologic analysis pointed to influenza A as the cause of illness. CONCLUSIONS: The investigation revealed an unusual summer outbreak of influenza A concurrent with subclinical pertussis infection. Surveillance of acute respiratory illness in nursing homes throughout the year, rather than solely during epidemic periods, in combination with appropriate public health laboratory support, would allow initiation of a timely public health response to outbreaks of acute respiratory illness in this setting.     

Reintroduction of influenza A to a nursing building.

We report an outbreak of influenza A from a four-building veterans' facility in King, Wisconsin. Influenza was isolated in 154 of 721 residents over a 121-day period. Building A had 2 cases, no isolates for 40 days, followed by 27 cases. Building B had 25 cases, no isolates for 75 days, followed by 4 cases. Building C had 23 cases, no isolates for 14 days, followed by 17 cases. Influenza A may be reintroduced to a nursing building. Surveillance with contingency plans for restarting of prophylaxis must continue for the duration of influenza in the community.     

A cluster of unexplained deaths in a nursing home in Florida.

In the two-week period November 13-27, 1984, 12 patients died in a 54-bed nursing home in Florida; based on previous mortality patterns, 2.5 deaths would have been expected for the whole month. There was no similar increase in deaths in November 1984 and no comparable monthly death rate for any of 69 nursing homes in the same county from 1976-84. Comparison of the 12 deaths in November with 28 deaths that occurred during the previous 10 months and with 31 surviving patients who were continuously present in the nursing home between November 12-28, 1984 revealed that the patients who died in November were more likely to have had onset of the terminal event during the night shift, had a recent visitor, and had an admitting diagnosis of organic brain syndrome. The abrupt increase in the death rate for November 1984 was not associated with a measurable change in population characteristics, an outbreak of infectious disease, or changes in procedures or the environment. Reviews of employee schedules revealed a consistent and strong association between the duty times of two nurses and the onsets of the terminal episode and the times of patient deaths. Continuing epidemiologic surveillance of adverse outcomes in nursing homes is recommended.     

Rurality and nursing home quality: results from a national sample of nursing home admissions

OBJECTIVES: We examined differences in quality of care among nursing homes in locales of varying degrees of rurality. METHODS: We classified locales into 4 classes according to rurality. We analyzed a 10% sample of nursing home admissions in the United States in 2000 (n=198613) to estimate survival models for 9 quality indicators. RESULTS: For postacute admissions, we observed significant differences in rates of decline for residents in facilities in large towns compared with urban areas, but differences in quality were both negative and positive. Among admissions for long-term or chronic care, rates of decline in 2 of 9 quality areas were lower for residents in isolated areas. CONCLUSIONS: We observed significant differences in a number of quality indicators among different classes of nursing home locations, but differences varied dramatically according to type of admission. These differences did not exhibit the monotonicity that we would have expected had they derived solely from rurality. Also, quality indicators exhibited more similarities than differences across the 4 classes of locales. The results underscore the importance, in some instances, of emphasizing the effects of specific settings rather than some continuum of rurality and of moving beyond the assumption that nursing home residents constitute a homogeneous population.     

Selection bias in evaluating of influenza vaccine effectiveness: a lesson from an observational study of elderly nursing home residents

Selection bias is of critical concern in the study of influenza vaccine effectiveness when using an observational study design. This bias is attributable to the inherently different characteristics between vaccinees and non-vaccinees. The differences, which are related both to vaccination and signs of clinical disease as an outcome, may lead to erroneous estimation of the effectiveness. In this report, we describe how selection bias among elderly nursing home residents may lead to a spurious interpretation of the protective effect of influenza vaccine. Our results should be a lesson in the importance of regarding selection bias when assessing influenza vaccine effectiveness.     

Scabies in a nursing home

Cases of scabies crop up from time to time in Nursing Homes and similar closed communities. It is of prime importance that such instances should be dealt with appropriately and control measures undertaken to effect a speedy therapy and prevention of further spread.     

Reducing hospital admissions from a skilled nursing home

With good nursing care and the resources of a dedicated skilled nursing facility, many nursing home patients usually admitted to a hospital for various medical illnesses can be handled within the framework of the skilled nursing facility without necessarily incurring an increased nursing home death rate. The medical advantage to the patient and to the usually overburdened hospitals, as well as the economic advantage to the public in general, calls for a full evaluation and consideration of this alternative to the regular and ongoing practice of hospital admissions of the elderly nursing home patient. The experiences of Carmel Richmond Nursing Home, a skilled nursing facility, have shown that this alternate level of approach and care can be quite successful and beneficial to all involved, especially the nursing home patient.     

A nursing home rotation in a family practice residency

A nursing home rotation can be a complementary component of geriatrics education in a family practice residency curriculum. Using nursing homes in teaching geriatrics has been done for some time but has of late received more emphasis. This increasing emphasis has been brought about by the growing health care needs of an aging population and a concomitant focus on education in geriatrics. If implementation of a nursing home rotation is contemplated, both the positive and negative aspects of such action as it relates to the residents, the nursing home, and the nursing home patients should be explored. The rotation as incorporated into the geriatrics curriculum of the Family Practice Residency, Knoxville Unit, University of Tennessee College of Medicine, involves all second-year and third-year residents in the medical care for patients of a 222-bed long-term care facility. From an educational standpoint, overall evaluation of the rotation reflects satisfaction. The experience exemplifies personal and comprehensive continuity of patient care. Other educational benefits include desensitization to the nursing home environment, understanding the kinds of medical care that can be delivered in this setting, and appreciation for the cost not only to the patient and the family but also to the medical care system as well.     

Predictors of nursing home admission in a biracial population.

Racial differences in predictors of institutionalization were studied in a biracial North Carolina cohort (n = 4074). During 3 years of follow-up, 8.5% of Whites and 6.4% of African Americans were admitted to nursing homes. African Americans were one half as likely as Whites to be institutionalized after adjustment for other risk factors. Among Whites, impaired activities of daily living and cognition were the strongest predictors; among African Americans, impaired instrumental activities of daily living and prior history of nursing home use were strongest. Racial differences in nursing home use were not explained by financial and social support or physical and cognitive impairment.     

A social systems model of nursing home use.

Causal modeling (path analysis) was applied to data from the 39 mental health catchment areas of Massachusetts to analyze the effects of sociocultural and health-resource variables on long-term-care utilization. The variables chosen explained 53 percent of the variance of long-term-care use by persons 60 and older: 41 percent was explained by the sociocultural variables and 12 percent by the health-resource variables. With data adjusted for age, the major determinant of long-term-care use was ethnicity: less long-term care was used in areas with more persons who were foreign-born or had a foreign-born parent. The effects of other health resources (supply of primary care physicians and use of mental and general (short-term) hospitals) were small and negative.