Clark County Public Health officials have confirmed that a single measles case identified in January appears to have led to six additional infections. The department said the outbreak remains under investigation and that contact tracing is underway to identify others who may have been exposed.

The cases are believed to be linked to exposure sites in the Ridgefield area, though officials have not publicly released all locations. Health authorities stated that all known infected individuals are being monitored and isolated where appropriate.

Measles is a highly contagious viral disease that spreads through the air when an infected person coughs or sneezes. It can remain in the air for up to two hours after an infected person leaves an area. Complications can include pneumonia, encephalitis, and, in rare cases, death — particularly among unvaccinated populations.

Clark County Public Health is urging residents to verify their measles, mumps, and rubella (MMR) vaccination status. Those who believe they may have been exposed and are not fully vaccinated are advised to contact their healthcare provider before visiting any medical facility, to prevent possible exposure to others.

The county last experienced a major outbreak in 2019, when more than 70 cases were confirmed, primarily among unvaccinated children. Health officials said the current situation underscores the importance of maintaining high rates of immunization in the community to prevent further spread.

Further updates and public exposure location details are expected from Clark County Public Health as the investigation continues.

For more on the initial report, see KGW’s coverage.