Staph bacteria are commonly found on healthy skin and inside the nose without causing any trouble. An infection can develop when the bacteria enter broken skin, a wound or another part of the body where they do not belong. Most staph infections can be treated successfully, but recognising the signs early is important because some infections can spread quickly. On this page What is a staph infection? Six signs to recognise Who is more vulnerable? Diagnosis and treatment Protecting yourself and others When to seek urgent help What Is a Staph Infection? Staph infections are usually caused by Staphylococcus aureus . They can range from small skin infections to more serious infections involving the blood, lungs, heart, bones or other organs. MRSA is a type of Staphylococcus aureus that...