Anti streptolysin 0 test is diagnostic in -: (A) Acute rheumatic fever, (B) SLE, (C) SBE, (D) Rhematoid ahritis
Answer is A. Ans. is 'a' i.e., Acute rheumatic fever . ASO titres higher than 200 are indicative of prior streptococcal infection. High levels are usually found in acute rheumatic fever.