<prompt> Among the following, earliest test to be positive in leptospirosis is:Microagglutination test MATLeptospira culture of bloodIgM ELISA of serumMacroagglutination test  <response>: Test for leptospirosis:Time to become positive:MATmicroscopic agglutination testingSecond week of illnessIgM ELISAWithin 3-5 daysBlood culture7-14 days after exposureref:Harrisons 17e p1050 