Virulence factors of Group-A Streptococcus
Streptococcus are gram positive, catalase negative cocci. Are spherical or ovoid, 0.5-1µ in diameter, arranged in chains, non-motile and non-sporing. They may become gram negative in ageing culture when the bacteria die. Some of the strains possess capsules made up of hyaluronic acid while some of the strains possess capsules composed of polysaccharide. Human beings … Read more
