Vigorous exercise can cut flu risk

Doing vigorous exercise for at least 2.5 hours a week reduces the chances of developing flu, a new UK study claims.
The study by the London School of Hygiene & Tropical Medicine involved more than 4,800 people in an annual UK Flu survey.
The findings suggest that 100 cases of flu per 1,000 people could be prevented just by engaging in vigorous exercise, researchers said.
No differences were found in rates of flu-like illness based on the amount of moderate exercise reported, so it may be that more vigorous exercise is needed to lower your risk, they said.
"We're really interested in the preliminary findings around fitness activity and flu-like illness, as exercise is something that everyone can do to reduce your chance of having flu," Dr Alma Adler, Research Fellow at the London School of Hygiene & Tropical Medicine said.

"We need to treat this result cautiously as these are preliminary findings, however they are consistent with findings for other conditions and really show the health benefits of exercise," said Adler.
The annual UK Flusurvey is an on-line system for measuring influenza trends and uniquely collects data directly from the public.