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About two years ago, Alphonso Evans went to the hospital for what he thought was just another bladder infection and ended up in intensive care. In an effort to combat antibiotic-resistant superbugs, scientists have created "living antibiotics" made of viruses that have been genetically modified using the gene-editing tool CRISPR. Rob Stein/NPR hide caption

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Rob Stein/NPR

Scientists Modify Viruses With CRISPR To Create New Weapon Against Superbugs

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Katie Park/NPR

Surge In Antibiotics Is A Boon For Superbugs

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On the list of pathogens (from left): Staphylococcus aureus (causes skin infections, pneumonia, bloodstream infections), Pseudomonas aeruginosa (causes blood infections, pneumonia, infections after surgery) and Neisseria gonorrhoeae (causes the sexually-transmitted disease gonorrhea). NIAID; Scott Chimileski and Roberto Kolter, NIH Image Gallery/Flickr; NIAID hide caption

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NIAID; Scott Chimileski and Roberto Kolter, NIH Image Gallery/Flickr; NIAID

Chickens at a poultry farm in Hefei, eastern China. Antibiotics are often used to keep them healthy in densely packed quarters. STR/AFP/Getty Images hide caption

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STR/AFP/Getty Images

U.N. Pledges To Fight Antibiotic Resistance In Historic Agreement

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An employee of the drug company Apotex, examines some Ciprofloxacin at the plant in Canada. Cipro is commonly given to travelers for diarrhea. More than 20 million Cipro doses are prescribed each year in the U.S. Getty Images hide caption

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Getty Images

To fight antibiotic-resistant staph germs like these, a study suggests disinfecting the skin of all intensive care patients. Janice Carr/CDC hide caption

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Janice Carr/CDC

Klebsiella pneumoniae, seen here with an electron microscope, are the most common superbugs causing highly drug-resistant infections in hospitals. Kwangshin Kim/Science Source hide caption

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Kwangshin Kim/Science Source

Infections With 'Nightmare Bacteria' Are On The Rise In U.S. Hospitals

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