I have always been paranoid about passing the cold sore virus to my children. I took lots of precautions and made sure to wash my hands a lot, didn't give my children baths while I had a cold sore, tried not to breathe on them while I was changing diapers, never kissed them on the lips and typically never shared anything with them.
I screwed up one time though and let my one year old take one sip off my water bottle when I didn't have any symptoms, however a little later I did feel a tingle for about a minute or two and then it went away. I never ended up getting an actual cold sore, but was I still contagious? He did end up getting a couple bumps on his face about 5 days later and I was told it was hand foot and mouth and never thought about it again, but just recently (almost 2 years later) he had what looked like a cold sore. I am completely devestated and feel like I failed my child at protecting him.
What is the chance of spreading the virus through that one incident? And when exactly are you contagious?