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ДЄn estimated 700 million GAS infections occur worldwide each year. Under ideal conditions, it has an incubation period of 1 to 3 days. pyogenes can be cultured on fresh blood agar plates. Staphylococci are catalase positive whereas streptococci are catalase-negative.

The main criterion for differentiation between Staphylococcus spp. The species name is derived from Greek words meaning 'a chain' ( streptos) of berries ( coccus ) and pus ( pyo)-forming ( genes), since a number of infections caused by the bacterium produce pus. The name group A (beta-hemolytic) Streptococcus ( GABHS) is thus also used. Group A streptococci, when grown on blood agar, typically produce small (2вЂ“3В mm) zones of beta-hemolysis, a complete destruction of red blood cells.

However, both Streptococcus dysgalactiae and the Streptococcus anginosus group can possess group A antigen as well.

pyogenes is the predominant species harboring the Lancefield group A antigen, and is often called group A Streptococcus ( GAS).

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They are clinically important for humans, as they are an infrequent, but usually pathogenic, part of the skin microbiota that can cause Group A streptococcal infection. These bacteria are extracellular, and made up of non-motile and non-sporing cocci (round cells) that tend to link in chains. Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus.