True statement about antistreptolysin 'O' titer is
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
In normal people the titre is > 200
In acute glomerulonephritis the titre is low
ASO titre > 200 indicate rheumatic fever
It is poorly antigenic
All India exam