which had ranked as one of the largest outbreaks within the U.

There were several measles outbreaks last year.would see a level of immunity because of infection.

were exposed to measles virus.combined with the virus spreading into a large group that had been unvaccinated.When were talking about measles.

000 kindergarten children at risk of measles infection during the last school year.since the virus was declared eliminated from the country in 2000.

The massive surge in 2019 could also have temporarily blunted transmission.

Just 81% of people worldwide are now estimated to have received the first dose of a measles vaccine.describing the uptick as a canary in the coal mine.

were exposed to measles virus.Up to 9 in 10 people without immunity will get infected after being exposed.

There were several measles outbreaks last year.That year had marked a global resurgence of the virus to some of the highest levels in years.