Bacteria photos: Staphylococcus aureus; beta-hemolysis

Beta-hemolysis of Staphylococcus aureus, hemolysins of S.aureus

beta-heemolysis,Staphylococcus aureus growing on blood agar plate

S. aureus appears as grape-like clusters when viewed through a microscope, and has large, round, golden-yellow colonies, often with beta hemolysis, when grown on blood agar plates. Beta hemolysis (β-hemolysis), sometimes called complete hemolysis, is a complete lysis of red cells in the media around and under the colonies: the area appears lightened (yellow) and transparent. There are four Staphylococcus aureus hemolysins (alfa-hemolysin, beta-hemolysin, gamma-hemolysin and delta-hemolysin).