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Yale University researcher Benjamin Chan, who studies viruses that attack bacteria, holds the bacteriophage treatment for patient Ella Balasa, of Richmond, Va., at Osborn Memorial Laboratories, in New Haven, Conn., Thursday, Jan. 17, 2019. Bacteriophages were discovered a century ago but largely shelved when easier-to-use antibiotics came along. (AP Photo/Richard Drew)

Yale University researcher Benjamin Chan, who studies viruses that attack bacteria, holds the bacteriophage treatment for patient Ella Balasa, of Richmond, Va., at Osborn Memorial Laboratories, in New Haven, Conn., Thursday, Jan. 17, 2019. Bacteriophages were discovered a century ago but largely shelved when easier-to-use antibiotics came along. (AP Photo/Richard Drew)

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