Influenza, commonly known as flu, is a virus that can be spread by droplets. It can occur anytime of the year, but the majority of cases occur in December through March. Flu vaccines are the single best way to protect yourself from getting the flu. It is best to be vaccinated in early fall, as it takes two to four weeks to build up immunity. You can still develop the flu after being vaccinated, but cases are generally milder than for those that have not been vaccinated.
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