How common is syphilis transmission through kissing?

Hi. Syphilis sores can be in the mouth, so it is possible to get syphilis from deep kissing. But it is not a common way for syphilis to be passed. Sexually transmitted infections (STI) like gonorrhea and Human papillomavirus (HPV) can also be passed with deep kissing, but they are also not commonly passed this way. read more

It is very uncommon to hear of someone contracting syphilis via kissing. Usually syphilis is transmitted via sexual contact - contact with genitals. However, in theory, it is possible to transmit syphilis via contact with syphilitic sores (chancres) during non-sexual acts like kissing. read more

Syphilis infection occurs in three distinct stages: Early or primary syphilis. People with primary syphilis will develop one or more sores. The sores are usually small painless ulcers. They occur on the genitals or in or around the mouth somewhere between 10-90 days (average three weeks) after exposure. read more