The quarantine period for measles is 21 days from the exposure, which is the maximum incubation period before the tell-tale rash appears. Measles is highly infectious, with up to 90 percent of unvaccinated or otherwise vulnerable people contracting the virus upon exposure. People infected with measles are infectious from four days before the rash appears to four days after its onset.
The outbreak is occurring in the northern region of South Carolina, with many cases identified in Spartanburg County, which contains Inman, as well as Greenville County. Both counties have low vaccination rates. For the 2024–2025 school year, only 90 percent of Spartanburg students were vaccinated, while Greenville’s vaccination
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