<prompt> True statement about Antistreptolysin ;O; titre isIn normal people the titre is 200In acute glomerunephritis the titre is lowASO titre 200 indicate rheumatic feverStreptozyme test is an active haemagglutination test  <response>: In Rheumatic fever and glomerulonephritis, a retrospective diagnosis of streptococcal infection may be established by demonstrating high levels of antibody to streptococcal toxins. The standard test in antistreptolysin O titration. High levels are usually found in acute rheumatic fever but in glomerulonephritis, titers are often low. Reference: Textbook of Microbiology; Anathanarayan and panikers; 10th edition; Page no: 218 