Staphylococci are a group of Gram-positive bacteria that can cause a wide range of infections in humans. They are spherical-shaped and typically occur in clusters, hence the name 'cocci' which is derived from the Greek word for 'BERRY'. Staphylococci are found on the skin and mucous membranes of humans and animals, and can cause a variety of illnesses ranging from minor skin infections to life-threatening conditions such as sepsis.