Transmission 1.Intimate sexual contact with infectious lesions. most common,>95% untreated patient 2. transplacental passage during the later stages of pregnancy (4 months) -congenital syphilis 3.blood transfusions 4.Indirect contact kiss,suckle,infectantTransmission 1. Intimate sexual contact with infectious lesions, most common, >95% untreated patient 2. transplacental passage during the later stages of pregnancy (4 months) - congenital syphilis. 3. blood transfusions 4. Indirect contact kiss, suckle, infectant