欧洲疾控中心：梅毒-2022年年度流行病学报告（英文版）

Syphilis is a sexually transmitted infection caused by the bacterium Treponema pallidum [1]. It can also be transmitted from the mother to the child (congenital syphilis). Syphilis can be acquired during sexual activity by direct contact with treponema-rich, open lesions and contaminated secretions from an infected partner. After an average incubation period of three weeks (range 10−90 days) a lesion (chancre, that is usually painless) at the site of infection occurs (primary syphilis), follo