Superbugs have become the scourge of hospitals worldwide. They have evolved because common bacterial infections developed a resistance to antibiotics. The best-known is methicillin-resistant Staphylococcus aureus, known as MRSA. In America the Centres for Disease Control and Prevention says that around 94,000 people get serious mrsa infections each year and 19,000 of them die. Yet around one-third of people carry some form of S. aureus without coming to any harm. As researchers come to understand more about the mechanism that keeps some people safe, that knowledge could be used to help those who become ill.
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