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Penicillin, effective against many bacterial infections, is often a first-line antibiotic. Yet it is also one of the most common causes of drug allergies. Around 10 percent of people say they’ve had an allergic reaction to penicillin, according to the U.S. Centers for Disease Control and Prevention.

Now researchers have found a genetic link to the hypersensitivity, which, while rarely fatal, can cause hives, wheezing, arrythmias and more.  

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By Jeanne Erdmann