Health officials have confirmed four measles cases in northern Arizona's Navajo County, The Arizona Republic reported Monday night.
They are the first cases of the highly contagious respiratory virus in Arizona in 2025, the newspaper reports.
"The four cases in Navajo County involve people who were not vaccinated against measles. The four were infected from a single source and have a recent history of international travel, health district officials say," The Republic's article says.
Three or more related cases are considered an active outbreak, according to the U.S. Centers for Disease Prevention.
The U.S. logged 122 more cases of measles last week — four of them in Texas — while outbreaks in Pennsylvania and Michigan officially ended, the Associated Press reported Monday.
There were 1,168 confirmed measles cases in the U.S., the CDC said Friday.
Other U.S. states with active outbreaks include Colorado, Illinois, Kansas, Montana, New Mexico, North Dakota, Ohio and Oklahoma.
"Measles is caused by a highly contagious virus that’s airborne and spreads easily when an infected person breathes, sneezes or coughs. It is preventable through vaccines, and has been considered eliminated from the U.S. since 2000," the Associated Press says.
