Microbiology Streptococcus Pyogen Bacteria

Question:-

Written summary of the basic physiology and metabolic qualities and characteristics of the Streptococcus pyogen bacteria

Answer:-

Streptococcus pyogenes is that facultative, spherical and gram-positive anaerobic bacterium having similarity with the Staphylococcus species’ cellular morphology. This bacterial species keeps growing within longer chains v/s the clusters like grapes as seen for Staphylococcus. S. pyogenes, called the flesh-eating bacteria, becomes that bacterium, most pathogenic in the genus entirely. The A antigen has a presence on its cell wall for the microbe causing beta-haemolysis zones, that erythrocyte disruptions and haemoglobin release completely. S. pyogenes consists of F protein, the fibronectin-binding protein, giving that ability in adhering to epithelial cells in the respiratory tract throughout (“Microbiology Microbes Bacteria Information and Links – Microbes.info |”, 2020). Another virulence factor, called protein M, has this coil fibrillar-coiled, allowing this bacterium in reducing and resisting phagocytosis.

Their cell walls are made of G polysaccharide-peptidoglycan and C polysaccharide-peptidoglycan complexes. These are non-spore-forming, non-motile coccus occurring among chains or in cell pairs. Individualized cells are rounded to the ovoid cocci having micrometre of 0.6-10 in diameters. This bacterium can survive without and with oxygen. This occurs although the anaerobes most facultative keep preferring the aerobic conditions greatly. S. pyogenes metabolism becomes fermentative where this metabolism’s principal product is lactic acid. The streptococcus keeps growing in agar media with blood supplementation allowing the β-hemolysis detection. The selective media (like this agar media containing Columbia agar or phenyl ethyl alcohol with nalidixic acid and colistin, providing culturing conditions adequately (“Online Textbook of Bacteriology”, 2020). For diagnosing S. pyogenes, culturing on sheep blood agar with throat swabs can be utilized for diagnosis. This agar has the trypticase soy base in air incubation, the reference method when diagnosing