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...
Important viruses and their properties
Group Virus Characteristics Clinical importance Retroviruses Human T-cell leukaemia virus(HTLV-1) Human immune deficiency...