Flu Vaccine Doesn't Protect Seniors From Pneumonia

THURSDAY, July 31 (HealthDay News) -- Flu vaccine may not protect older people from pneumonia once they get the disease, researchers report.

Older, frail adults are more susceptible to getting the flu, even if they have been vaccinated, and once getting the flu, they are more susceptible to such complications as pneumonia. It had been thought that flu vaccine would prevent flu -- and pneumonia -- across all groups of seniors, but this benefit appears to be largely confined to younger, healthier seniors.

"In seniors, flu vaccine was not linked to a reduced risk of pneumonia," said lead researcher Michael L. Jackson, a postdoctoral fellow at the Group Health Center for Health Studies in Seattle.

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Jackson still recommends that seniors get flu vaccine, however. "There have been good randomized trials that show, at least in healthy seniors, that the vaccine reduces the risk of influenza," he said. "However, earlier studies have overestimated how well the vaccine works in reducing complications of influenza. So, the vaccine may not reduce the risk of complications as much as previously thought," he said.

Among young healthy seniors, the vaccine reduces the risk of flu, Jackson said. "When you look at the total population of seniors, which includes people over 75 and people that have chronic health diseases -- lung disease, heart disease, diabetes, and things like that -- we don't know if the vaccine is effective in the seniors," he said. "People with these chronic diseases are more susceptible to getting the flu, and they are more likely to develop pneumonia if they do get influenza."

The report is published in the Aug. 2 issue of The Lancet.

For the study, Jackson's team collected data on 1,173 people between the ages of 65 and 94 who developed pneumonia They compared these individuals with 2,346 people who did not get pneumonia. Both groups had similar rates of flu vaccination over the three seasons of studies, the researchers say.

The researchers found that vaccinated seniors who got the flu were as likely to develop pneumonia as unvaccinated seniors who got the flu.