The Fairfax County Health Department is currently investigating a suspected case of measles in a Fairfax County resident, the county’s public information office reported today. Test results will not be known for approximately 24 hours.

Health officials are currently identifying potential exposure sites, and the individual is in self-isolation at home, according to the report. No other details will be announced until test results become available. If the case is positive, a news conference will be held tomorrow, Feb. 11. Fairfax health officials have stressed that people who have received at least one dose of measles, mumps and rubella vaccine in the past are at very low risk of being infected with measles.

Measles is easily preventable through safe and effective MMR vaccine. The best protection against future measles cases is the on-time vaccination of all susceptible people.