Is it possible for a child to carry viruses or illnesses, not be sick himself, and still transfer it to my kids? The last 10 times or so that we have played with the neighbors, my oldest ends up with a fever, strep, stomach bug etc. Last time she was sick for 8 weeks!!! And it's 1-3 days after playing with the neighbor kids. Is this possible? Has anyone else had something like this happen or is it just a coincidence?