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How to time your flu shot for best protection

Gustavo Perez got his influenza vaccine from pharmacist Patricia Pernal in early September during an event hosted by the Chicago Department of Public Health at the city's Southwest Senior Center. This year's flu season may strike earlier and harder than usual, experts warn. A flu shot's your best protection. (Scott Olson/ Getty Images)
Gustavo Perez got his influenza vaccine from pharmacist Patricia Pernal in early September during an event hosted by the Chicago Department of Public Health at the city's Southwest Senior Center. This year's flu season may strike earlier and harder than usual, experts warn. A flu shot's your best protection. (Scott Olson/ Getty Images)

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