<prompt> A 16-year-old boy is admitted with fever, icterus, conjunctival suffusion and hematuria for 15 days. Which serological test should be done for diagnosis?Weil-Felix reactionWidal testPaul Bunnel testMicroscopic agglutination test  <response>: Microscopic agglutination test is used for diagnosis of Leptospirosis. History of fever with livericterus and kidneyhematuria involvement should arouse suspicion for leptospirosis Weil;s disease. Serotype-specific tests: Microscopic agglutination test Macroscopic agglutination test WIDAL test is used to screen for typhoid fever Weil Felix reaction is used to diagnose rickettsial fevers Paul Bunnell test is the investigation of choice for infectious mononucleosis. Reference: Ananthanarayan and Paniker;s Textbook of Microbiology Tenth edition 