AdvertisementHow to time your flu shot for best protectionOctober 01, 2022Rob SteinfacebookEmailGustavo 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)