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Superbugs, also known as drug-resistant bacterial infections, can cause infections that are hard to treat. These clever germs have found ways to survive in the face of treatments with antibiotics, the drugs that usually kill bacteria.
In fact, according to the Centers for Disease Control and Prevention (CDC), all bacterial infections in the world are slowly becoming resistant to antibiotic treatments. That's because disease-causing bacteria are living organisms that constantly evolve, enabling them to adapt to new environments. Antibiotic resistance develops over time — it can start from even a very small number of microbes within a population that have genes that allow them to continue to grow, despite the use of drugs that would normally kill them.
Researchers suggest that some microbes are able to survive antibiotic treatments because they swap genes with each other, making them drug-resistant.
In any case, the bacteria that survive an antibiotic treatment eventually outnumber the population of bacteria that are susceptible to the drug.
Here are 6 superbugs that can be challenging to treat.
Klebsiella pneumoniaeSlide 2 of 13
Klebsiella pneumoniaebacteria can infect the lungs and lead to pneumonia. The bacteria can also infect wounds or surgical sites, or spread through the body via blood infections.
Normally, Klebsiella bacteria can be found in humans'[s1] mouths, intestines and skin, and they cause no harm to people with healthy immune systems. But certain strains, like Klebsiella pneumoniae, can be dangerous for some people with weakened immune systems, particularly those in hospitals.
One strain of the bacteria is also resistant to a number of antibiotics, making the infection hard to treat. This type of Klebsiella pneumoniae produces an enzyme known as carbapenemase, which prevents antibiotics called carbapenems from killing the bacteria and treating the infection.
To prevent spread of infection, the CDC recommends patients and hospital personnel follow strict hygiene procedures, such as hand-washing and wearing hospital gowns and gloves.Slide 3 of 13
Methicillin-resistant Staphylococcus aureusSlide 4 of 13
Methicillin-resistant Staphylococcus aureus
MRSA, which stands for methicillin-resistant Staphylococcus aureus, is a strain of bacteria that's resistant to the antibiotics used to treat typical staph infections. The bacteria can spread by touching, as often occurs in hospitals.
Once the bacteria enters the body, they can spread to bones, joints or major organs such as the lungs, heart or brain.
The rate of MRSA infections in hospital patients has increased in recent years, according to a recent study published in the August issue of the journal Infection Control and Hospital Epidemiology. Results showed that in 2003, an average of 21 out of every 1,000 hospital patients developed an infection. The number jumped up to 42 out of 1,000 patients in 2008.
The best way to prevent the spread of MRSA is for health care workers and hospital visitors to keep their hands clean, according to the CDC.Slide 5 of 13
Clostridium difficileSlide 6 of 13
Clostridium difficilebacteriaare found in the intestines. Healthy people who have enough "good" bacteria in their intestines may not get sick from a C. diff infection. But for people with weak immune systems, the germ can cause a number of symptoms, such as diarrhea or life-threatening inflammation of the colon.
People who take antibiotics are at greater risk of C. diff infection, because antibiotics can kill the good germs in the intestines, leaving an imbalance.
C. difficilecan cause severe diarrhea, and the germ is linked to 14,000 American deaths each year, according to the CDC.
In about one in four patients, the infection may go away within two to three days after stopping antibiotic use, according to the CDC. Once the infection is gone, doctors generally prescribe another antibiotic for 10 days to make sure the infection doesn't return.Slide 7 of 13
Extensively Drug Resistant TuberculosisSlide 8 of 13