<prompt> A foueen year old body is admitted with history of fever, icterus, conjunctival suffusion and haematuria for twenty days. Which of the following serological test can be of diagnostic utility -Widal testMicroscopic Agglutination TestPaul Bunnell testWeil felix reaction  <response>: Ans. is b i.e., Microscopic agglutination test History of fever, jaundice icterus, bleeding diathesis conjuctival suffusion and renal dysfunction hematuria are suggestive of Weils disease severe Leptospirosis. A definite diagnosis of leptospirosis is based either on isolation of the organism from the patient or on seroconversion or a rise in antibody titer in microscopic agglutination test MAT. 