The flu, or influenza, is a highly contagious respiratory illness caused by influenza viruses. Many people wonder, “How long is the flu contagious?” Understanding the contagious period of the flu can help in preventing the spread of the virus. Generally, a person infected with the flu is contagious from one day before symptoms appear and can remain contagious for up to seven days after becoming sick. Children and those with weakened immune systems might be contagious for an even longer period.
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