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Could the Flu Shot Lower Your Risk for Alzheimer’s?

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MONDAY, July 27, 2020 (HealthDay News) — Getting vaccinated to protect against pneumonia and flu may offer an unexpected benefit — a lower risk of Alzheimer’s disease, new research suggests.

Two new studies being presented Monday at this summer’s virtual Alzheimer’s Association International Conference found a lower incidence of Alzheimer’s in people who got flu and pneumonia vaccines. A third study underscored the importance of prevention, reporting that people with dementia are more likely than others to die if they get serious infections.

“For people concerned about Alzheimer’s disease, these vaccines may provide an extra protective effect,” said Albert Amran, who is presenting his findings on flu vaccine and Alzheimer’s. Amran is a medical student at McGovern Medical School at the University of Texas Health Science Center in Houston.

He and his team looked at a nationwide database of more than 9,000 people over age 60. They found that people who had received at least one flu shot had a 17% reduction in Alzheimer’s disease risk. And those who consistently got their annual flu shot had an even lower risk, Amran said.

For people between ages 75 and 84, this translated to an almost 6% lower Alzheimer’s risk over 16 years, the researchers noted.

Amran pointed out that the study can only show a link between vaccines and a reduced risk of Alzheimer’s disease.

“Without a clinical trial, we can’t say for sure that there’s a causative effect,” he said.

Svetlana Ukraintseva, an associate research professor at Duke University in Durham, N.C., led the second study, which examined Alzheimer’s risk among more than 5,100 seniors. It found that people who got pneumonia and flu shots between 65 and 75 years of age had up to 30% lower odds of Alzheimer’s.

People with genes that increase Alzheimer’s risk didn’t have as much of a vaccine-related reduction. This study didn’t find a reduction in Alzheimer’s risk based on flu shots alone.

Heather Snyder, vice president of medicine and scientific affairs at the Alzheimer’s Association, said it’s not yet clear how getting vaccinated might help reduce Alzheimer’s risk: Does having a particular infection affect the brain somehow, setting the stage for Alzheimer’s? Does getting a vaccine lead to a reduction in inflammation and other factors tied to the disease? Or, do people who get shots have healthier habits, such as exercising regularly, which can protect their brains?





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