How long is a common cold contagious for? and are we contagious even before symptoms appear?

Up to 10 days: Peak viral shedding is on days 2-5. Once symptoms have resolved, patients are no longer infectious. Incubation period is typically 24-48 hours, but may be as short as 12 hours. Virus isn't usually shed until symptoms appear. Thanks for trusting HealthTap!

Common cold: This condition can be caused by a large variety of viruses, the most common is rhinovirus. People are most contagious for the first 2 to 3 days of a cold. A cold is usually not contagious after the first week. Cold symptoms usually start about 2 or 3 days after you came in contact with the virus, although it could take up to a week. Symptoms mostly affect the nose.