KIEV, UKRAINE - MAY 15: Doctors in the hallway of the measles ward at the Oleksandryvskyi Medical Clinic on May 15, 2019 in Kiev, Ukraine. As Ukraine struggles with its largest measles outbreak in decades, registering 35,000 cases and 14 deaths in the first three months of 2019, the disease has spread to other European countries and the United States. (Photo by Brendan Hoffman/Getty Images)
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