system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In a syphilis patient, site which does not help in isolation of organism:-
assistant
The correct answer is  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.