In a syphilis patient, site which does not help in isolation of organism:-: (A) Gumma, (B) Primary chancre, (C) Mucosal patch, (D) Maculopapular rash
Answer is A. T. pallidum is very difficult to demonstrate in Gumma (Teiary syphilis). Infectivity of a patient to the sexual paner is maximum during primary, secondary and early latent stage. During these stages spirochetes are abundant in the lesions.