Measles virus detected in Clark County wastewater

No reported cases; Health District urges residents to check vaccination status ahead of school year

FOR IMMEDIATE RELEASE:
August 7, 2025

LAS VEGAS — The Southern Nevada Health District has detected the presence of measles virus in the wastewater in Clark County. This is the first detection of measles virus in local wastewater and serves as an early indicator that the virus may be present in the community. There are currently no confirmed cases of measles among Clark County residents, and a subsequent wastewater sample was negative for the virus.

However, the Health District is still urging residents—especially families with school-age children—to make sure they are up to date on their measles-mumps-rubella (MMR) vaccinations.

“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,” said Dr. Cassius Lockett, District Health Officer for the Southern Nevada Health District. “Vaccination is our best defense against measles, and with the start of the school year approaching, now is the time to make sure children are protected.”

Measles is a highly contagious virus that spreads through coughing and sneezing. Early symptoms include high fever, cough, runny nose and red, watery eyes, followed by a rash that usually starts on the face and spreads downward. People who develop symptoms should stay home, avoid contact with others and notify their health care provider before visiting any medical facility. This helps prevent the potential spread of illness in waiting rooms or clinical settings.

Wastewater surveillance can detect viral genetic material that is shed by infected individuals. A positive detection could indicate an undiagnosed or unreported measles infection in the area. Some health departments have identified human cases following similar detections.

Clark County has not had a confirmed case of measles in a resident since 2018. In April 2024, the Health District reported a measles exposure from a visitor to the area, but no local cases resulted from that incident.

Immunizations Available Ahead of School Year
With the new school year beginning Monday, August 11, the Health District is encouraging parents and guardians to schedule required vaccinations now. MMR is one of several vaccinations required for school enrollment.

Back-to-school immunizations are available by appointment at Health District clinics across the Valley, including special extended hours. To view clinic locations, hours and make an appointment, visit www.snhd.info/bts. For more information about measles and the MMR vaccine, visit www.cdc.gov/measles/vaccines.

The Southern Nevada Health District serves as the local public health authority for Clark County, Boulder City, Henderson, Las Vegas, Mesquite and North Las Vegas. The agency safeguards the public health of the community’s residents and visitors through innovative programs, regulations, and initiatives focused on protecting and promoting their health and well-being. More information about the Health District, its programs, services, and the regulatory oversight it provides is available at www.SNHD.info. Follow the Health District on Facebook, Twitter, and Instagram.