A nurse prepares a syringe for a measles vaccination at a pediatric clinic in Kiev, Ukraine. The country had 72,408 measles cases in the year from March 2018 to February 2019 — the highest number for any country during that period.

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A nurse prepares a syringe for a measles vaccination at a pediatric clinic in Kiev, Ukraine. The country had 72,408 measles cases in the year from March 2018 to February 2019 — the highest number for any country during that perio