Incubation period of syphilis

Ans. a (9-90 days). (Ref. Harrison, Principles of Internal Medicine, 18th /Chapter 169. Syphilis)SYPHILIS# T. Pallidum enters foetal circulation after 20th week of gestation with disappearance of cytotrophoblast in villi.0# Basic pathology is obliterative endarteritis.# Placenta becomes bulky and spirochaete can hardly be found in placenta.# Spirochaete can however be detected from maculopapular rash in baby.# Irrespective of the serology, treatment should be repeated in subsequent pregnancies.# Incubation period of syphilis is 9-90 days