Scanning electron micrograph of a human neutrophil ingesting<unk> <unk>  <unk>  is a group of Gram-positive bacteria that are genetically distinct from other strains of Staphylococcus aureus.<unk>  is responsible for several difficult-to-treat infections in humans. It caused more than 100,000 deaths attributable to antimicrobial resistance in 2019.<unk>  is any strain of S. aureus that has developed (through natural selection) or acquired (through horizontal gene transfer) a multiple drug resistance to beta-lactam antibiotics. Beta-lactam (β-lactam) antibiotics are a broad-spectrum group that include some penams (penicillin derivatives such as<unk>  and oxacillin) and cephems such as the cephalosporins. Strains unable to resist these antibiotics are classified as<unk> -susceptible S. aureus, or MSSA.<unk>  is common in hospitals, prisons, and nursing homes, where people with open wounds, invasive devices such as catheters, and weakened immune systems are at greater risk of healthcare associated infection.<unk>  began as a hospital-acquired infection but has become community-acquired, as well as livestock-acquired. The terms HA-MRSA (healthcare-associated or hospital-acquired<unk> , CA-MRSA (community-associated<unk> , and LA-MRSA (livestock-associated<unk>  reflect this.
Methicillin-resistant Staphylococcus aureus
Vancomycin-resistant Staphylococcus aureus
Vancomycin-resistant Enterococcus
Streptococcus bovis
Carbapenem-resistant enterobacteriaceae
Streptococcus pyogenes
Staphylococcus haemolyticus
Corynebacterium diphtheriae