Summary
For most, a cold is contagious for about 2 weeks in total.
1
You can spread the virus 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.
2
You can actually infect someone before you start feeling symptoms of the cold and you are most contagious in the 3 to 4 days after you start to feel sick.
3
You might be contagious from the moment you’re infected and that can last up to 4-7 weeks.
3
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