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drug-resistance

Malaria parasites, spread by a mosquito's bite, have started to adapt so the go-to drugs won't knock them out. Daniel Heuclin/Nature Picture Li/Getty Images/Nature Picture Libr hide caption

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Daniel Heuclin/Nature Picture Li/Getty Images/Nature Picture Libr

A Pennsylvania woman developed a urinary tract infection cased by Escherichia coli bacteria that were found to be resistant to colistin, an antibiotic that is seen as the last line of defense. Nature's Geometry/Science Source hide caption

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Nature's Geometry/Science Source

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

Yonta, 6, rests with her sister Montra, 3, and brother Leakhena, 4 months, under a mosquito net in the Pailin province of Cambodia — an epicenter of drug-resistant malaria. Paula Bronstein/Getty Images hide caption

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Paula Bronstein/Getty Images