What is Staph?

Staph is a type of bacteria. Up to one-third of all people carry Staph on their skin or in their nose and are "colonized", but not infected, with Staph. They have no symptoms, yet they can pass the germ to others.

Ordinary Staph is usually harmless unless it enters the body through a cut or wound. Even then, it typically only causes minor skin infections (such as pimples and boils) that heal without antibiotics. In fact, Staph is one of the most common causes of minor skin infections in the United States. Unfortunately, ordinary Staph can also sometimes lead to a more serious infection called MRSA. People at highest risk are the elderly, people with open wounds or weak immune systems, and very young children. MRSA is seen most often in nursing homes and hospitals, where Staph bacteria can get into surgical wounds and the bloodstream and cause a serious form of pneumonia.

What is MRSA?

MRSA (methicillin-resistant Staphylococcus aureus) is a serious type of Staph infection that cannot be cured by common antibiotics (methicillin, oxacillin, penicillin and amoxicillin). MRSA is treatable with other drugs and medical procedures. An estimated 1.2 million hospital patients in the United States are infected with MRSA each year; another 423,000 US hospital patients are colonized with MRSA each year.

Remember that many people carry Staph infection without having any symptoms. While 25% to 30% of the population may be colonized with Staph, only about 1% of people have been colonized with MRSA.

What is Community-Acquired MRSA (CA-MRSA)?

Most MRSA cases occur in nursing homes and hospitals. However, 10-15% of MRSA cases occur in people who have not been in the hospital or had surgery, dialysis, catheterization or other medical procedures in a year or more. These cases are called community-acquired MRSA (CA-MRSA). These usually show up as skin infections— pimples or boils or abscesses— and usually occur in people who are otherwise healthy.

What Are the Symptoms of CA-MRSA?

The most common signs of any sort of Staph infection are:

  • Redness, swelling, and tenderness at the site of what may look like a pimple
  • A painful, pus-filled rash
  • What appears to be a cluster of severely infected spider bites,
  • Impetigo with fluid-filled blisters
  • Blisters or pus-filled boils or abscesses.

Sometimes people will notice more than one sore at a site. Some people with MRSA will have multiple lesions (sores) that look like spider bites. The involved site is red, swollen, and painful and may have pus or other drainage.

More serious Staph infection may lead to bloodstream infections or pneumonia. Symptoms may include shortness of breath, fever, and chills.

Do People Die from CA-MRSA Infections?

On rare occasions, community-acquired MRSA can cause life-threatening illness and death, even when treated quickly. However, in the vast majority of cases, community-acquired MRSA infections are limited to the skin and do not result in severe complications.

Prevention and Treatment

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Health
Infectious Diseases