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MRSA infection
Introduction
Methicillin-resistant Staphylococcus aureus (MRSA) infection is caused by Staphylococcus aureus bacteria — often called "staph." Decades ago, a strain of staph emerged in hospitals that was resistant to the broad-spectrum antibiotics commonly used to treat it. Dubbed methicillin-resistant Staphylococcus aureus (MRSA), it was one of the first germs to outwit all but the most powerful drugs. MRSA infection can be fatal. Staph bacteria are normally found on the skin or in the nose of about one-third of the population. If you have staph on your skin or in your nose but aren't sick, you are said to be "colonized" but not infected with MRSA. Healthy people can be colonized with MRSA and have no ill effects, however, they can pass the germ to others. Staph bacteria are generally harmless unless they enter the body through a cut or other wound, and even then they often cause only minor skin problems in healthy people. But in older adults and people who are ill or have weakened immune systems, ordinary staph infections can cause serious illness called methicillin-resistant Staphylococcus aureus or MRSA. In the 1990s, a type of MRSA began showing up in the wider community. Today, that form of staph, known as community-associated MRSA, or CA-MRSA, is responsible for many serious skin and soft tissue infections and for a serious form of pneumonia. Vancomycin is one of the few antibiotics still effective against hospital strains of MRSA infection, although the drug is no longer effective in every case. Several drugs continue to work against CA-MRSA, but CA-MRSA is a rapidly evolving bacterium, and it may be a matter of time before it, too, becomes resistant to most antibiotics. Signs and symptoms
Staph infections, including MRSA, generally start as small red bumps that resemble pimples, boils or spider bites. These can quickly turn into deep, painful abscesses that require surgical draining. Sometimes the bacteria remain confined to the skin. But they can also burrow deep into the body, causing potentially life-threatening infections in bones, joints, surgical wounds, the bloodstream, heart valves and lungs. Although the survival tactics of bacteria contribute to antibiotic resistance, humans bear most of the responsibility for the problem. Leading causes of antibiotic resistance include: Unnecessary antibiotic use in humans. Like other superbugs, MRSA is the result of decades of excessive and
unnecessary antibiotic use. For years, antibiotics have been prescribed for colds, flu and other viral infections that don't respond to these drugs, as well as for simple bacterial infections that normally clear on their own. Antibiotics in food and water. Prescription drugs aren't the only source of antibiotics. In the United States, antibiotics can
be found in beef cattle, pigs and chickens. The same antibiotics then find their way into municipal water systems when the runoff from feedlots contaminates streams and groundwater. Routine feeding of antibiotics to animals is banned in the European Union and many other industrialized countries. Antibiotics given in the proper doses to animals who are sick don't appear to produce resistant bacteria. Germ mutation. Even when antibiotics are used appropriately, they contribute to the rise of drug-resistant bacteria because
they don't destroy every germ they target. Bacteria live on an evolutionary fast track, so germs that survive treatment with one antibiotic soon learn to resist others. And because bacteria mutate much more quickly than new drugs can be produced, some germs end up resistant to just about everything. That's why only a handful of drugs are now effective against most forms of staph. Risk factors
Because hospital and community strains of MRSA generally occur in different settings, the risk factors for the two strains differ. Risk factors for hospital-acquired (HA) MRSA include: A current or recent hospitalization. MRSA remains a concern in hospitals, where it can attack those most vulnerable —
older adults and people with weakened immune systems, burns, surgical wounds or serious underlying health problems. A 2007 report from the Association for Professionals in Infection Control and Epidemiology estimates that 1.2 million hospital patients are infected with MRSA each year in the United States. They also estimate another 423,000 are colonized with it. Residing in a long-term care facility. MRSA is far more prevalent in these facilities than it is in hospitals. Carriers of MRSA
have the ability to spread it, even if they're not sick themselves. Invasive devices. People who are on dialysis, are catheterized, or have feeding tubes or other invasive devices are at
Recent antibiotic use. Treatment with fluoroquinolones (ciprofloxacin, ofloxacin or levofloxacin) or cephalosporin antibiotics
These are the main risk factors for community-acquired (CA) MRSA: Young age. CA-MRSA can be particularly dangerous in children. Often entering the body through a cut or scrape, MRSA
can quickly cause a wide spread infection. Children may be susceptible because their immune systems aren't fully developed or they don't yet have antibodies to common germs. Children and young adults are also much more likely to develop dangerous forms of pneumonia than older people are. Participating in contact sports. CA-MRSA has crept into both amateur and professional sports teams. The bacteria spread
easily through cuts and abrasions and skin-to-skin contact. Sharing towels or athletic equipment. Although few outbreaks have been reported in public gyms, CA-MRSA has spread
among athletes sharing razors, towels, uniforms or equipment. Having a weakened immune system. People with weakened immune systems, including those living with HIV/AIDS, are
more likely to have severe CA-MRSA infections. Living in crowded or unsanitary conditions. Outbreaks of CA-MRSA have occurred in military training camps and in
Association with health care workers. People who are in close contact with health care workers are at increased risk of
When to seek medical advice
Keep an eye on minor skin problems — pimples, insect bites, cuts and scrapes — especially in children. If wounds become infected, see your doctor. Ask to have any skin infection tested for MRSA before starting antibiotic therapy. Drugs that treat ordinary staph aren't effective against MRSA, and their use could lead to serious illness and more resistant bacteria. Screening and diagnosis
Doctors diagnose MRSA by checking a tissue sample or nasal secretions for signs of drug-resistant bacteria. The sample is sent to a lab where it's placed in a dish of nutrients that encourage bacterial growth (culture). But because it takes about 48 hours for the bacteria to grow, newer tests that can detect staph DNA in a matter of hours are now becoming more widely available. In the hospital, you may be tested for MRSA if you show signs of infection or if you are transferred into a hospital from another healthcare setting where MRSA is known to be present. You may also be tested if you have had a previous history of MRSA. Treatment
Both hospital and community associated strains of MRSA still respond to certain medications. In hospitals and care facilities, doctors generally rely on the antibiotic vancomycin to treat resistant germs. CA-MRSA may be treated with vancomycin or other antibiotics that have proved effective against particular strains. Although vancomycin saves lives, it may grow resistant as well; some hospitals are already seeing outbreaks of vancomycin-resistant MRSA. To help reduce that threat, doctors may drain an abscess caused by MRSA rather than treat the infection with drugs. Prevention
Hospitals are fighting back against MRSA infection by using surveillance systems that track bacterial outbreaks and by investing in products such as antibiotic-coated catheters and gloves that release disinfectants. Still, the best way to prevent the spread of germs is for health care workers to wash their hands frequently, to properly disinfect hospital surfaces and to take other precautions such as wearing a mask when working with people with weakened immune systems. In the hospital, people who are infected or colonized with MRSA are placed in isolation to prevent the spread of MRSA to other patients and healthcare workers.Visitors and healthcare workers caring for isolated patients may be required to wear protective garments and must follow strict handwashing procedures. What you can do
Here's what you can do to protect yourself, family members or friends from hospital-acquired infections.
Ask all hospital staff to wash their hands before touching you — every time. Ask to be bathed with disposable cloths treated with a disinfectant rather than with soap and water. Make sure that intravenous tubes and catheters are inserted and removed under sterile conditions; some hospitals have dramatically reduced MRSA blood infections simply by sterilizing patients' skin before using catheters. Preventing CA-MRSA
Protecting yourself from CA-MRSA — which might be just about anywhere — may seem daunting, but these common-sense
precautions can help reduce your risk:
Keep personal items personal. Avoid sharing personal items such as towels, sheets, razors, clothing and athletic
equipment. MRSA spreads on contaminated objects as well as through direct contact. Keep wounds covered. Keep cuts and abrasions clean and covered with sterile, dry bandages until they heal. The pus from
infected sores often contains MRSA, and keeping wounds covered will help keep the bacteria from spreading. Sanitize linens. If you have a cut or sore, wash towels and bed linens in hot water with added bleach and dry them in a hot
dryer. Wash gym and athletic clothes after each wearing. Wash your hands. In or out of the hospital, careful hand washing remains your best defense against germs. Scrub hands
briskly for at least 15 seconds, then dry them with a disposable towel and use another towel to turn off the faucet. Carry a small bottle of hand sanitizer containing at least 62 percent alcohol for times when you don't have access to soap and water. Get tested. If you have a skin infection that requires treatment, ask your doctor if you should be tested for MRSA. Many
doctors prescribe drugs that aren't effective against antibiotic-resistant staph, which delays treatment and creates more resistant germs. http://www.mayoclinic.com/health/mrsa/DS00735/DSECTION=1

Source: http://www.crhs.cr.k12.de.us/WellnessCenter/FeaturedArticles/MRSA.pdf

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