KIEV, UKRAINE - MAY 15: Alisa Ganiyeva, age 6, tended to by her mother Katya Ganiyeva, cries nervously before receiving a measles vaccine shot in health clinic № 10 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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