how is it passed on

Through intimate sexual contact, that is not protected in any way. It lives in Vaginal fluids in women and Semen in men.

Blood to Blood contact, as in touching open wounds, or like when kids exchange blood in an old ritual of becoming “blood friends”.

Mothers’ Milk

These are the most common means of infection. Also, it is now known that it can enter your body through the penis foreskin if you are not circumsized.

I hope this helps, Donny.