Methicillin-resistant Staphylococcus aureus (MRSA) are opportunistic pathogenic commensals affecting humans. Especially of immunodeficient persons they can lead to severe infections that are difficult to treat. Hospitals - especially their intensive care wards - are considered to be the main source of infection. In addition old people's homes and nursing homes are also associated with elevated risks of infection (NEUHAUS et al., 2003). In recent years, apart from infections not only infections with MRSA in hospitals (known as nosocomial infections or "hospital acquired MRSA" (haMRSA)) an increasing number of infections that did not originate in the hospital sphere have been detected. These infections are termed "community acquired MRSA" (caMRSA).