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Content: Colonization refers to a condition when bacteria are present on the skin or within the body but are not causing an infection. When Staphylococcido cause an infection, it is commonly referred to as a Staphylococcusinfection, or staph infectionfor short. Staph bacteria are one of the most common causes of skin infections in the United States. Most of these infections are minor (such as pimples and boils) and can be treated without antibiotics. However, staph bacteria can cause serious infections, such as surgical wound infections, bloodstream infections, and pneumonia. Causes of Human Staphylococcal Infections
There are only a few different types of Staphylococcusbacteria known to cause infections in humans. Four of them include: Staphylococcus aureus (S. aureus), the most common type of staph infection 
Staphylococcus epidermidis, a primary cause of infections in the hospital 
Staphylococcus saprophyticus, a common cause of urinary tract infections(UTIs) in young adult women 
Staphylococcus lugdunensis, infections that can range from minor to life-threatening. Some Staphylococcusbacteria are resistant to certain antibiotics. Methicillin-resistant Staphylococcus aureus, or MRSA for short, is a type of Staphylococcusthat is resistant to antibiotics called beta-lactams.