Romania had the most, 5,562. Italy also experienced a severe outbreak with 5,006 cases in 2017 compared to 843 the year before. Ukraine was also badly impacted by the virus in 2017 with 4,767 cases.
The WHO reported that all of these countries experienced a range of different challenges in recent years such as declines in overall routine immunization coverage, consistently low coverage among some marginalized groups, interruptions in vaccine supply or underperforming disease surveillance systems.
This post originally appeared on the blog of data firm Statista and is republished here with permission.