Costa Rica has not had a domestic case of measles since 2006, and the last imported case occurred in 2014. The measles two-dose vaccine is 97 percent effective against the virus, according to the CDC, but the number of children who aren’t being vaccinated by 24 months old has been gradually increasing.
People choosing not to vaccinate have become a global health threat in 2019, the World Health Organization reported.
Anti-vaccination hot spot: What to know about the measles outbreak, affecting over 60 in Washington
Contributing: Ashley May and Brett Molina, USA TODAY
Follow N’dea Yancey-Bragg on Twitter: @NdeaYanceyBragg
This article originally appeared on USA TODAY: Unvaccinated French boy brings measles to Costa Rica for the first time in five years