How Long for Flu to Incubate

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Let’s say your coworker, Brenda, coughed directly into your coffee cup. (Rude, Brenda.) The timer starts the moment the virus enters your body. Usually through your nose, mouth, or eyes—you know, the fun holes.

For the first 12 to 24 hours, you’re in the stealth mode phase. You feel totally normal. Maybe even invincible. Don’t be fooled. That virus is throwing a rave in your respiratory tract.

Day 1: The Quiet Before the Storm

About 24 hours in, you might feel a tickle. Or a vague sense of “meh.” It’s so subtle you might blame it on bad sleep or a sad movie. This is often when you’re most contagious, sneaking germs on every doorknob.

Most people start shedding the virus like glitter at a craft fair 24 hours before symptoms. So, congrats: you’re a walking bioweapon and you don’t even know it yet.