. Syphilis Transmission sexual contact, genital congenital in utero or during birth transfusion of blood Not highly contagious (-30% chance of acquiring disease after single exposure to infected partner), but transmission rate dependent upon stage of disease ong incubation period during which time host is non-infectious Chronic infection slowly progressiⅳve10 •Syphilis • Transmission - sexual contact, genital - congenital in utero or during birth - transfussion of blood Not highly contagious (~30% chance of acquiring disease after single exposure to infected partner) , but transmission rate dependent upon stage of disease Long incubation period during which time host is non-infectious •Chronic infection slowly progressive