Flu vaccines for nursing home workers effective in reducing outbreaks: study

Higher flu vaccination rates for health care personnel can dramatically reduce the threat of flu outbreak among nursing home residents, according to a study published in the October issue of Infection Control and Hospital Epidemiology, the journal of the Society for Healthcare Epidemiology of America.

The study, which focused on nursing homes in New Mexico, found that when a facility had between 51 and 75 percent of its health care personnel with direct patient care vaccinated, the chances of a flu outbreak in that facility went down by 87 percent.

"The Centers for Disease Control and Prevention have long recommended that health care personnel in nursing homes get vaccinated against the flu, but we didn't know just how much help these recommendations might be in reducing flu outbreaks among residents," said Aaron Wendelboe of the University of Oklahoma, the lead author of the study. "We found strong evidence to support the CDC's recommendation that to protect residents of nursing homes, health care personnel should be vaccinated annually."

In association with the New Mexico Department of Health, Wendelboe and his team surveyed influenza rates at the state's 75 long-term care facilities during the 2006-2007 and 2007-2008 flu seasons. They then looked for correlations between vaccination rates at each facility and whether there was an influenza outbreak.

While increased vaccination of direct care healthcare workers was associated with fewer flu outbreaks, the study found that vaccination rates among residents did not discourage outbreaks. In fact, higher resident vaccination was correlated with a higher probability of an outbreak. That result was unexpected and hard to explain, the researchers say. "While the explanation is likely multi-factorial, we suspect a large factor is that facilities with high resident vaccination rates may over-rely on the direct protection bestowed by vaccinating the residents and under-value the indirect protection bestowed by vaccinating employees," Wendelboe and his team write.

Despite recommendations by the CDC and the Society for Healthcare Epidemiology of America, vaccination rates among U.S. healthcare workers still hover under 65 percent.

"That vaccinating health care personnel provided more protection to residents than vaccinating residents themselves underscores the importance of these recommendations," Wendelboe said.

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Published through a partnership between the Society for Healthcare Epidemiology of America and The University of Chicago Press, Infection Control and Hospital Epidemiology provides original, peer-reviewed scientific articles for anyone involved with an infection control or epidemiology program in a hospital or healthcare facility. ICHE is ranked 15 out of 140 journals in its discipline in the latest Journal Citation Reports from Thomson Reuters.

SHEA is a professional society representing more than 1,900 physicians and other healthcare professionals around the world with expertise in healthcare epidemiology and infection prevention and control. SHEA's mission is to prevent and control healthcare-associated infections and advance the field of healthcare epidemiology. The society leads this field by promoting science and research and providing high-quality education and training in epidemiologic methods and prevention strategies. SHEA upholds the value and critical contributions of healthcare epidemiology to improving patient care and healthcare worker safety in all healthcare settings.