After a year marked by measles outbreaks across the U.S., is the virus now endemic?​After a year marked by measles outbreaks across the U.S., is the virus now endemic? 

 Measles has been spreading in the U.S. for a year, a milestone that could mean the virus can no longer be considered eliminated.  ​​Measles has been spreading in the U.S. for a year, a milestone that could mean the virus can no longer be considered eliminated.