<prompt> True statement about antistreptolysin O titer isIn normal people the titre is 200In acute glomerulonephritis the titre is lowASO titre 200 indicate rheumatic feverIt is poorly antigenic  <response>: ASO Anti Streptolysin O titer:Estimation of antibody against streptolysin is a standard serological test for retrospective diagnosis of streptococcal infectionASO titer 200 is indicative of prior streptococcal infectionRaised after throat infection onlyIn acute glomerulonephritis the titer is low 