MTB 2025

Question 1 Which characteristic is responsible for mycobacteria being strongly acid-fast when stained?

Question 2 What is the approximate slow generation time of mycobacteria, which helps prevent immune recognition?

Question 3 Which major virulence factor of M. tuberculosis is described as trehalose-6,6”-dimycolate?

Question 4 According to the pathogenesis of Tuberculosis, what event occurs in Stage V after caseous tubercles liquefy?

Question 5 Which of the following is a clinical feature associated with pulmonary tuberculosis infection?

Question 6 Which chemical agent is used in the laboratory to liquefy non-sterile specimens for decontamination prior to mycobacteria examination?

Question 7 In the Ziehl-Neelsen staining technique, what color do non-acid-fast bacteria stain due to the counterstain?

Question 8 Which stain utilizes Tergitol as a mordant (wetting agent/surfactant) and is performed without steaming?

Question 9 According to the WHO reading interpretation for Ziehl-Neelsen stain, a result of 2+ indicates the presence of how many acid fast bacilli (AFB) per field?

Question 10 In the Runyon classification system based on pigment production, mycobacteria that produce pigment only when grown in the light are categorized as: