The Southern Nevada Health District announced Thursday it has detected the measles virus in Clark County wastewater.

Clark County has no confirmed measles cases and hasn’t since 2018. However, wastewater surveillance can indicate undiagnosed viral infections.

The Health District is urging Clark County residents to stay up to date on their children’s measles-mumps-rubella (MMR) vaccines, which are 97 percent effective at preventing measles after two doses, according to the Centers for Disease Control and Prevention.

“While a single wastewater detection does not mean we have confirmed measles cases or community transmission, it is a signal that shouldn’t be ignored,” Cassius Lockett, district health officer for the Southern Nevada Health District, wrote in a Thursday morning press release

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