Staphylococcal Infections: Causes and Treatment Staphylococcal infections, more commonly referred to as staph infections, represent a broad spectrum of diseases caused by the bacteria Staphylococcus. These bacteria are not strangers to human skin and mucous membranes, and under certain conditions, they can trigger infections ranging from minor skin issues to severe diseases. Members of the genus Staphylococcus still represent a topic of great relevance due to the numerous types of infections they cause in humans and animals. Staphylococci have emerged as important pathogens for both nosocomial and community-acquired infections in people. For example, USA300 is a predominant community-associated methicillin-resistant S. aureus strain; it carries an arginine catabolic mobile element (ACME) which contains potential virulence factors playing a role in bacterial ... Two species were described in 2015 – Staphylococcus argenteus and Staphylococcus schweitzeri – both of which were previously considered variants of S. aureus. Staphylococci are pathogenic bacteria responsible for a broad spectrum of diseases with varying degrees of severity. They are one of the main causes of nosocomial infections (hospital-acquired infections) but can also be acquired outside hospitals.