staphylococcus cohnii staphylococcus cohnii staphylococcus cohnii is a gram-positive, coagulase-negative member of the bacterial genus staphylococcus consisting of clustered cocci. the species commonly lives on human skin; clinical isolates have shown high levels of antibiotic resistance. a strain of s. cohnii was found to contain a mobile genetic element very similar to the staphylococcal cassette chromosome encoding methicillin resistance element seen in staphylococcus aureus. staphylococcus cohnii scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: staphylococcaceae genus: staphylococcus species: s. cohnii binomial name staphylococcus cohniischleifer and kloos 1975 (approved lists 1980)