Methicillin-resistant Staphylococcus aureus (MRSA) is a type of staph bacteria that is resistant to certain antibiotics called beta-lactams. These antibiotics include methicillin and other more common antibiotics such as oxacillin, penicillin, and amoxicillin. In the community, most MRSA infections are skin infections.hile there are many types or âspeciesâ of Acinetobacter and all can cause human disease, Acinetobacter baumannii [aszâinâeeâÃ©eâtoeâback terâbÅâmaaânee] ie accounts for about80 % of reported. Infections acinetobacter infections rarely occur outside of healthcare. settings