The official definition for anti streptolysin is " the antibody made against streptolysin O, an immunogenic, oxygen-labile hemolytic toxin produced by most strains of group A and many strains of groups C and G streptococci."

The official definition for anti streptolysin is " the antibody made against streptolysin O, an immunogenic, oxygen-labile hemolytic toxin produced by most strains of group A and many strains of groups C and G streptococci."

An antistreptolysin is an antibody made against streptolysin.

This is a serologic test, known as anti-streptolysin O. It measures the quantity of antibody to a component of streptococcal bacteria. This test is useful in diagnosing scarlet fever, rheumatic fever and other streptococcal disease. Treatment would depend on which particular malady needs to be dealt with.

bacterial agressins are molecules that the bacteria "shoot" at phagocytic molecules. Some agressin molecules include streptolysin O, leukocidin (staphylococcus), extoxin A, adenylate cyclase, and anthrax toxin EF