Linked from
The 19 pages that link to Syphilis, each with the reason it gives.
Oral sexRelated: Contact with an infectious sore can transmit syphilis during oral sex.
Penicillin GRelated: Penicillin G is the preferred treatment for most stages of syphilis.
Treponema pallidumRelated: This is the principal disease caused by the bacterium.
FellatioRelated: An infectious lesion can transmit syphilis during oral contact.
PapuleRelated: Secondary syphilis can produce widespread papular eruptions.