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The common cold tends to be most contagious when the symptoms are at their worst (usually day 2 to day 4 of the cold symptoms presenting themselves). That being said, a cold virus can be contagious for 2 to 3 days prior to symptoms presenting themselves until all symptoms have gone away (sometimes up to 2+ wks).
Wiki User
∙ 15y ago
Wiki User
∙ 11y agoAdults are contagious one or two days before symptoms of the common cold start and approximately a week after. Children can be contagious even longer, as much as two weeks after symptoms have started. You are most contagious earlier in your illness rather than later. Some people can be infected with a common cold virus and have no symptoms, but still spread the virus to others.
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