The Washoe County Health District says officials are working to confirm the diagnosis after two people showed measles-like symptoms.
One attended the Sparks school and the other may have infected co-workers. The workplace wasn't disclosed.
Authorities say people who might have been exposed should monitor themselves for 21 days for symptoms including fever, cough, runny nose and a blotchy rash.
Measles is a highly contagious respiratory illness that can spread through coughing or sneezing.
People at highest risk are those who are unvaccinated, pregnant women, infants under six months old, and those with weakened immune systems.