My sister lives a long way away and was going to make the big trip to visit me tomorrow for a few days but got a cold four days ago. If I catch new bugs I get slammed. I've always gone by the rule that people are no longer infectious five days after their symptoms first appear; I'm now wondering where I got this idea and if it's true.
Does anyone know? Is there any evidence on this?
Does anyone know? Is there any evidence on this?