Can french kissing transmit hepatitis b, c or a?

Kissing & Hepatitis. No. Not in any way would this be a risk for any of these three Hepatitis Viruses. Hepatitis A is ingested from food or infected stool. It is not transmitted from saliva. Hepatitis B and C are specifically transmitted from blood not saliva. .
Possibly. A definitely, but acute A injection has a brief incubation period so statistically not very likely. B is transmitted via blood or other infected body fluid (usually semen) - so saliva more unusual but possible. C typically requires blood to blood contact. bottom line - know your partners and stay safe!

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