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Officials explain quarantine rules, testing and why most measles cases are in unvaccinated people
Summary
Local health officials explained the difference between quarantine and isolation, the 21-day incubation window, limits of post‑exposure vaccination, and that state labs test to distinguish wild‑type measles from vaccine-related symptoms.
Buncombe County health officials used a Facebook Live session to explain how quarantine, isolation and laboratory testing work during local measles cases and why most infections occur in unvaccinated people.
Dr. Jennifer Mollendorf, Buncombe County medical director, described quarantine as the separation of people who have been exposed and isolation as separating people who are confirmed or suspected to have measles. She emphasized the incubation period: “how long it might take for measles to show up could be up to 21 days after their last exposure,” and said exposed people may need to be restricted from high‑risk settings such as school or childcare for that period.
Dr. Mollendorf cautioned that post‑exposure MMR can be effective only within 72 hours of exposure and that, in practice, testing and contact investigations make meeting that window unlikely. She advised proactive steps: check vaccine records, know your immune status, and seek vaccination before exposure.
On breakthrough infections, Dr. Mollendorf said the vast majority of cases are in people who are unvaccinated; partially vaccinated people can have cases and fully vaccinated people very rarely do. She explained state lab processes for distinguishing vaccine‑strain symptoms from true wild‑type measles: specimens go to the state public‑health lab and, when needed, to a reference lab (identified in the session as in Wisconsin) for genotyping. “If that shows that it was vaccine strain, it is not considered a case of measles,” she said.
Clinicians also reminded the public that measles virus can linger in the air: “Measles hangs in the air for 2 hours,” Dr. Fogelman said, underlining why keeping symptomatic people out of waiting rooms and calling ahead to facilities matters.
The county recommended residents who suspect exposure call ahead to their provider or emergency department so staff can arrange safe care or use airborne isolation rooms where available. Officials reiterated that vaccination remains the most reliable prevention.
