How long are you contagious when you have the flu or a cold?

According to the Centers for Disease Control (CDC), "People with flu are most contagious in the first three to four days after their illness begins. Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick."

"You're generally contagious with a cold 1-2 days before your symptoms start, and you could be contagious as long as your symptoms are present—in rare cases, up to 2 weeks." (cedars-sinai.org)

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