Methicillin-resistant Staphylococcus aureus or Multidrugresistant Staphylococcus aureus is a unique strain of Staphylococcus aureus that is resistant to almost all penicillintype antibiotics, including methicillin and other betalactamase-resistant penicillins. MRSA was first discovered in the United Kingdom in 1961 and is now widely disseminated as “Superbugs”.
In the past, staphylococci only caused infections in the skin or wounds. However, due to excessive use of antibiotics, S. aureus strains have developed resistance. Even without a wound can also lead to drug-resistant Staphylococcus aureus infections. Symptoms can be rampant and even necrotizing fasciitis.
MRSA infections often originate in hospitals or gyms. Staphylococcus aureus is generally planted in the anterior foramen, which may infect the skin and soft tissues of the respiratory tract, wounds, venous catheters and urethra, causing abscesses, redness, fever and pus.
It is reported  that among all hospitalized patients, the average length of hospital stay of patients infected with MRSA is three times that of other patients, and the mortality rate is five times that of other patients.
1. Arch Intern Med. 2005, 165: 1756–1761