Taking a Look at Streptococcus Pyogenes

777 Words3 Pages
“Streptococcus Pyogenes is a Gram-positive, nonmotile, nonsporeforming coccus that occurs in chains or in pairs of cells.” (Todar's Online Book of Bacteriology) In history, Streptococcus pyogenes got its ill repute as the cause of puerperal fever, a life-threatening disease that was seen in women after childbirth, until Ignaz Semmelweis exposed that it could be stopped by physicians just washing their hands before each vaginal examination.( Live Strong) S. pyogenes is one of the most frequent pathogens found in humans. An estimate of between 5-15% of humans port the bacterium S. pyogenes without any symptoms of illness. S. pyogenes can be usually found habituating in the respiratory tract of humans. Several infections cause by Streptococcus Pyogenes includes pharyngitis, or better known as strep throat, scarlet fever, impetigo, cellulitis, and rheumatic fever. (Todar’s Online Book of Bacteriology) Morphology and Classification Streptococcus pyogenes is categorized on the origin of colony morphology, hemolysis, and biochemical reactions. .Streptococcus pyogenes is a sphere-shaped bacterium or cocci that appear in chain-like constructions. It stains purple when the Gram stain system is used. This indicates that S.pyogenes is a gram positive bacterium. When the bacterium is grown on agar with sheep blood, it appears as a glowing colony with a region of hemolysis surrounding the colony. This is a result to the precise enzymes that are produced by Streptococcus pyogenes. S.
Open Document