This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Most sensitive test for Treponema ? 
Select and explain. 
A. VDRL, B. RPR, C. FTA-ABS, D. Kahn
C: FTA-ABS
Answer: C: FTA-ABS 
Explanation: Ans. is 'c' i.e., FTA-ABS test TPPA is the most sensitive serological test overall (considering all stages of syphilis). All the serological tests have 100% sensitivity in secondary stage of syphilis. Amongst the given options FTA - ABS is most sensitive. Sensitivity of serodiagnostic tests in syphilis Test Primary Secondary Latent Teiary * VDRL /RPR 78 (74-87) 100 95 (88-100) 71(37-94) * FTA-ABS 84 (70-100) 100 100 96 * TP - PA 89 100 100 NA