6 doctors weighed in:

How big is the risk of transmission for my 4 week old, a friend with a cold sore held him while talking for about 5 mins? (I didn't notice until then)

6 doctors weighed in
Dr. David Dantes
General Practice
3 doctors agree

In brief: It's possible

Cold sores are frequently caused by a virus, herpes simplex.
The virus is spread by direct contact with a cold sore, or contact with bodily fluids which are contaminated with the virus. Coughing or sneezing is more likely to transmit this infection than talking, but some tiny droplets are released during talking. For more info: http://www.webmd.com/skin-problems-and-treatments/tc/cold-sores-topic-overview

In brief: It's possible

Cold sores are frequently caused by a virus, herpes simplex.
The virus is spread by direct contact with a cold sore, or contact with bodily fluids which are contaminated with the virus. Coughing or sneezing is more likely to transmit this infection than talking, but some tiny droplets are released during talking. For more info: http://www.webmd.com/skin-problems-and-treatments/tc/cold-sores-topic-overview
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