how long is the flu contagious? The flu is highly contagious, and people infected with the virus can spread it to others even before symptoms appear. Most people with the flu are contagious for up to 7 days after the onset of symptoms, but children and people with weakened immune systems can be contagious for longer periods. It is essential to take precautions like washing your hands and wearing a mask to prevent the spread of the flu.
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