beta hemolysis


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β he·mol·y·sis

complete or "true" hemolysis observed in blood agar cultures of various bacteria, especially hemolytic streptococci and staphylococci; virtually all the erythrocytes are destroyed in a relatively wide, regularly circumscribed, circular zone about the colony, thereby resulting in a clear "halo" of transparent agar; the zone of hemolysis is frequently much wider than the diameter of the colony; the degree of change varies with species of erythrocytes.

beta hemolysis

the development of a clear zone around a bacterial colony growing on blood agar, characteristic of certain pathogenic bacteria. Compare alpha hemolysis.
References in periodicals archive ?
Strain VI exhibited beta hemolysis, whereas V2 exhibited alpha hemolysis.
Colonies will exhibit beta hemolysis and need to be differentiated from other beta-hemolytic organisms.
pseudoporcinus if it was a catalase-negative, gram-positive coccus; had positive agglutination results with group B PathoDx antiserum; and produced a wide zone of beta hemolysis on the blood agar--in contrast to the zone that is typically (though not always) narrower for GBS.