Las Vegas health officials are sounding the alarm for anyone who hit CONEXPO this month, after a visitor who attended the trade show on March 6 and 7, and who spent time in the convention center area on March 8, tested positive for measles and was infectious while in town. The Southern Nevada Health District is urging people who were at the Las Vegas Convention Center on those dates and who are not fully vaccinated, or who have never had measles, to contact their health care provider and keep a close eye out for symptoms.
Exposure Tied To ConExpo At The LVCC
According to KTNV, the Southern Nevada Health District said the visitor was infectious the entire time they were at CONEXPO and in the convention center area. Officials are telling anyone who might have crossed paths with the visitor to double-check their immunization records. The district is directly reaching out to people it can identify as contacts and is advising anyone unsure about their immunity to talk with a medical provider. Health officials also stress that anyone who starts to feel sick should stay away from others and call ahead before going to a clinic so staff can prepare appropriate precautions.
How Measles Spreads And What To Watch For
Measles is extremely contagious. The virus can hang in the air and linger on surfaces for up to two hours after an infected person leaves a space, and up to nine out of 10 people who are susceptible may become infected after being exposed, according to CDC guidance. Symptoms usually appear between seven and 21 days after exposure and often start with fever, cough, runny nose and red eyes, followed by the classic measles rash. Public-health guidance says anyone who thinks they might have been exposed should monitor for these signs and isolate if symptoms show up.
Local Context And Vaccination Levels
This warning is landing in a region that has already been on alert. Public-health officials have urged vigilance as outbreaks in nearby states raise the risk that measles could be brought into Southern Nevada. The Las Vegas Review‑Journal has reported on local monitoring efforts, including the Southern Nevada Health District's use of wastewater and other surveillance tools. Regional reporting and industry bulletins have pointed to active clusters in Arizona and Utah as a reason for heightened concern, according to local outlets. The Health District has also recorded a confirmed visitor-related case in 2025, a reminder that travelers can seed local exposures even if they are just passing through.
What To Do If You Were At The Show
For anyone who was at the Las Vegas Convention Center on those dates and is not fully immunized, the CDC notes that getting an MMR vaccine within 72 hours of exposure may prevent or lessen illness for some people, and that immune globulin can be offered for certain high-risk groups for up to six days after exposure. Anyone with questions or who develops symptoms is urged to contact the Southern Nevada Health District. Officials again ask that people who are feeling sick call ahead before heading to a doctor's office, urgent care or hospital so staff can put safety measures in place. Health authorities continue to emphasize that two doses of MMR provide the strongest protection for most people and remain the recommended defense against measles.
