The South Carolina Department of Public Health Mobile Health Unit, shown on October 20, has been providing vaccinations, including for measles, in a library parking lot. Ken Ruinard/USA Today Network/Imagn Images

Near the back corner of the local library’s parking lot, largely out of view from the main road, the South Carolina Department of Public Health opened a pop-up clinic in early November, offering free measles vaccines to adults and children.

Spartanburg County, in South Carolina’s Upstate region, has been fighting a measles outbreak since early October, with more than 50 cases identified. Health officials have encouraged people who are unvaccinated to get a shot by visiting its mobile vaccine clinic at any of its several stops throughout the county.

But on a Monday afternoon i

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