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wood prints microbiology wood prints microorganism wood prints microscopic organism wood prints bacteria wood prints prokaryote wood prints unicellular organism wood prints single-celled organism wood prints infectious agent wood prints histopathology wood prints streptococcus pyogenes wood prints s. pyogenes wood prints streptococcus wood prints gram-positive wood prints gram positive wood prints gram wood prints

photographs microbiology photos microorganism photos microscopic organism photos bacteria photos prokaryote photos unicellular organism photos single-celled organism photos infectious agent photos histopathology photos streptococcus pyogenes photos s. pyogenes photos streptococcus photos gram-positive photos gram positive photos gram photos

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Scanning electron micrograph of Streptococcus pyogenes bacteria bound to a human neutrophil. Streptococcus pyogenes is a spherical, Gram-positive bacterium that is the cause of group A streptococcal infections. Streptococcus pyogenes displays streptococcal group A antigen on its cell wall. Streptococcus pyogenes typically produces large zones of beta-hemolysis (the complete disruption of erythrocytes and the release of hemoglobin) when cultured on blood agar plates, and are therefore also called Group A (beta-hemolytic) Streptococcus (abbreviated GABHS). Streptococci are catalase-negative. In ideal conditions, S. pyogenes has an incubation period of approximately 1-3 days. It is an infrequent, but usually pathogenic, part of the skin flora. It is estimated that there are more than 700 million infections world wide each year and over 650,000 cases of severe, invasive infections that have a mortality rate of 25 %.