Localized measles outbreak with 3 cases identified in Placer County

Placer County Public Health is reporting three measles cases, all teenagers in a single family linked through household exposure. An additional fourth case is suspected, also a family member. They are believed to have been exposed initially through an extended family member, not a Placer County resident, who had traveled to South Carolina, where a large measles outbreak is ongoing. Vaccination status for all was unable to be independently confirmed, and all are recovering at home. The only child enrolled in school was the suspect case and was not in attendance during the suspected infectious period, which occurred during a scheduled break. There were no school exposures and no public exposure risks reported for this localized outbreak. "We believe the risk to the general public remains low, as this outbreak appears to be contained within an extended family," said Placer County Health Officer Dr. Rob Oldham. "Nonetheless, it's a good reminder to take proactive steps, especially when traveling to states or countries with active measles spread." Measles is an extremely contagious virus that spreads through the air when an infected person breathes, coughs or sneezes. The virus can linger in shared spaces for up to two hours after the person has left. If others breathe in that air or touch a contaminated surface and then touch their eyes, nose or mouth, they can become infected. Up to 90 percent of people without immunity who are exposed to measles will become ill. "With local immunization rates now approaching state averages, our school‑age population provides a solid layer of community immunity," said Oldham. "Measles vaccinations are available through healthcare providers, and our county immunization clinics are available to explore as options for those who are uninsured or face barriers." Residents are encouraged to confirm their vaccination status, particularly before traveling to other states or countries, or before visiting crowded destinations such as airports, large events or theme parks. Future updates on this outbreak, if any, would be posted to the Public Health website, placer.ca.gov/publichealth, which also offers additional resources around measles and other communicable diseases.