However it is now known that not all S. aureus are coagulase positive and that incorrect species identification can impact effective treatment and control measures.

It was believed that all species were coagulase-positive however it is now known that not all Staphylococcus are coagulase positive.

The main coagulase-positive staphylococcus is Staphylococcus aureus, although not all strains of Staphylococcus aureus are coagulase positive.

Indeed, a dog's saliva is bactericidal against the bacteria Escherichia coli and Streptococcus canis, although not against coagulase positive Staphylococcus or Pseudomonas aeruginosa.