The ASO (Antistreptolysin O) test is primarily utilized to diagnose which condition?

Explanation

The ASO test detects antibodies against streptolysin O, a toxin produced by Streptococcus bacteria. It is mainly used to confirm a recent streptococcal infection that can lead to rheumatic fever. It is not used for diagnosing rheumatoid arthritis, typhoid fever, or rickettsial infections.