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photographs microbiology photos microorganism photos microscopic organism photos science photos bacteria photos bacterial photos bacteriology photos pathogen photos pathogenic photos prokaryote photos unicellular organism photos single-celled organism photos infectious agent photos histopathology photos phagocytosis photos

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Scanning electron micrograph of phagocytosis of yeast particle, Streptococcus pyogenese. Phagocytosis is the engulfing and ingestion of bacteria or other foreign bodies by phagocytes. Streptococcus pyogenese is a spherical gram-positive bacterium that grows in long chains and is the cause of Group A streptococcal infections. 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...