In Focus:

Flu Can Have Dangerous Domino Effect on Seniors

 Even months after recovering from the flu, older people remain at increased risk for a heart attackstrokeor disability, a doctor who specializes in infectious diseases warns.

"We all know about the illness influenza causes -- obviously fever and making you feel poorly, aches and pains -- and that is because it sets up a systemic inflammatory response," said Dr. William Schaffner.

He's a professor of preventive medicine and infectious disease at Vanderbilt University School of Medicine in Nashville.

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