The results apply to people age 60 and older living in the community, the authors note. Studies of the elderly in nursing homes and other institutions did not meet quality standards for the review.
The authors caution that most of the studies took place more than 10 years ago, before the recent threats of viral pandemics such as SARS, H1N1 and avian flu. These events “changed the level of concern of both the public and the health professions, with many interventions at international, societal and regional levels, and often with nightly news bulletins,” they wrote.
Medicare has covered flu shots since 1993 and about 65 percent of elderly Americans now get one annually. The U.S. Department of Health and Human Services has set a goal of vaccinating 90 percent of seniors.
“The overall trend for vaccination rates is going up, particularly among seniors,” said lead author Roger Thomas, M.D., a professor of family medicine at the University of Calgary in Canada. “How relevant is research prior to 2000 to our situation today?” he asked.
The review authors identified 44 randomized controlled trials of various methods to increase flu shot rates among seniors, but only 11 studies followed the highest standards of quality. In the three reliable studies of patient reminders, about 5,000 participants received a letter, postcard or phone call personalized to his or her health status. All of these studies show that this approach is effective.
Two of three high-quality studies indicate that vaccination rates go up when professional facilitators encourage physicians and health care teams to perform preventive services. In these studies, facilitators visited about 20 practices on a regular basis and employed education, feedback, consensus building and other techniques to elicit desired health outcomes.
The new report also draws attention to an updated Cochrane review published earlier this year, which rekindles a debate about the benefits of flu shots in the elderly. The co-authors of that review, including Thomas, found only one high-quality, randomized controlled trial. All other studies used less reliable methods, according to the review, making it difficult to draw clear conclusions.
The review appears in the current issue of The Cochrane Library, a publication of The Cochrane Collaboration, an international organization that evaluates research in all aspects of health care. Systematic reviews draw evidence-based conclusions about medical practice after considering both the content and quality of existing trials on a topic.
“According to reliable evidence, the effectiveness of … influenza vaccines in elderly individuals is modest,” the authors conclude. “Our estimates are consistently below those usually quoted for economic modeling or decision making.”
Indeed, less rigorous studies have suggested much more dramatic benefits of flu vaccines for the elderly. These include substantially fewer hospitalizations for pneumonia and flu, as well as reductions in overall death rates.
“There really do seem to be two divergent opinions about the benefit of flu vaccine,” said Ann Falsey, M.D., an infectious disease specialist at the University of Rochester Medical Center in New York. “My own view is that it’s a low-cost, low-risk treatment with efficacy, so I’m a very strong advocate for all seniors to get their flu shots.”
The U.S. Centers for Disease Control and Prevention (CDC) take a similar view and continue to recommend flu shots for people over 65.
Nevertheless, Falsey said, there is plenty of room for improvement in flu vaccines. Studies have shown that seniors have a weaker immune response to the standard shots than younger people. Falsey is lead author of a study that led to last year’s FDA accelerated approval of Fluzone High-Dose, a new, stronger vaccine specifically for seniors.
Regarding encouraging more people to receive vaccines, Falsey believes it is important for providers to address common misperceptions. “People think they’re not at risk, or they won’t get seriously ill, or they’ll get the flu from the shot,” she says.
“There is need for further research of excellent quality which brings interventions up to date with the current influenza challenge,” conclude the authors of the latest Cochrane review.
For the coming flu season, CDC is launching a universal vaccination campaign in September. The group now recommends seasonal flu shots for nearly everyone except pregnant women and babies younger than 6 months. Fluzone High-Dose will be available this fall, and officials say seniors can receive either the standard vaccine or the new, stronger version.
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The Cochrane Library (http://www.thecochranelibrary.com) contains high quality health care information, including Systematic Reviews from The Cochrane Collaboration. These reviews bring together research on the effects of health care and are considered the gold standard for determining the relative effectiveness of different interventions. The Cochrane Collaboration is an international nonprofit, independent organization that produces and disseminates systematic reviews of health care interventions and promotes the search for evidence in the form of clinical trials and other studies of interventions. Visit http://www.cochrane.org for more information.
Thomas RE, Russell M, Lorenzetti D. Interventions to increase vaccination rates of those 60 years and older in the community. Cochrane Database of Systematic Reviews 2010, Issue 9.