Gram positive cocci in clusters, coagulase positive
Staphylococcus aureus is a ubiquitous organism that colonizes the skin/nares and can cause invasive disease.
MRSA risk factors include:
Health care exposure
Intravenous drug abuse
Can be broadly divided into health-care associated (HA) and community associated (CA).
HA-MRSA is associated with many hospital associated infections ranging from minor/severe skin and soft tissue infections to bloodstream infections and severe pneumonia. It also causes many device associated infection and prosthetic infections.
CA-MRSA is associated with skin and soft tissue infections (e.g. abscesses) and necrotizing pneumonias. However, it can also cause many severe infections as with HA-MRSA.
Purulent skin and soft tissue infection
Infection of prosthetic devices