What type of bacteria are responsible for most skin infections?

Staphylococcus aureus is the primary bacterium responsible for most skin infections due to its ability to colonize the skin and hair follicles. This bacterium is commonly found on the skin and in the noses of healthy individuals, where it can enter the body through cuts, abrasions, or other breaches in the skin barrier. Once it infiltrates, it can cause a range of infections, from minor issues like boils and impetigo to more severe conditions such as cellulitis and abscess formation. Its prevalence, along with its capacity to produce toxins and resist certain antibiotics, makes it a leading cause of skin infections in both clinical and community settings.

In contrast, while E. coli is primarily associated with gastrointestinal issues, Streptococcus pneumoniae is more commonly linked to respiratory infections, and Salmonella is typically known for foodborne illnesses rather than skin infections. Thus, Staphylococcus aureus stands out as the correct answer in the context of skin infections.