When are colds contagious? | Go Ask Alice!

if you contract a cold, you can transmit it to others one or two days before your symptoms appear, and up to four or five days after first being exposed to the virus. According to the National Institutes of Health (NIH)(link is external), colds are most contagious two to four days after original exposure (whether or not symptoms have developed), when there is plenty of the virus present in nasal secretions.

http://goaskalice.columbia.edu/answered-questions/when-are-colds-contagious

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