If people are going to be infected by the cold virus, they tend to develop symptoms 1-2 days after they were exposed to the virus. Now, the good news is, if you are exposed to the cold virus, that doesn't necessarily mean that you are going to catch that cold virus. That is, if your immune system can fight off that cold, even if you've never been exposed to that serotype before, then you won't actually have that cold and you won't transmit it.