Gram-positive cocci are often isolated from clinical samples. It is important to be able to distinguish these organisms from one another because while some are normal flora, others can be pathogenic.

"Normal flora" include Streptococcus pneumoniae, Haemophilus influenzae, Staphylococcus aureus, and anaerobes such as Bacteroides species, anaerobic gram-positive cocci, and Fusobacterium species.

Symptoms that raise clinical suspicion of ... clinical features of infection without any other apparent source. Gram-positive cocci, predominantly S. epidermidis and S. aureus, cause bacteremia ...

His blood cultures are still growing gram-positive cocci and the patient has a urinary catheter since ... His abdominal pain improved and he did not complain of any respiratory symptoms. The patient ...