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An entrance to the Savannah River Site, a 310-square-mile nuclear complex neighboring New Ellenton and Jackson.

Another case of COVID-19, the disease caused by the novel coronavirus, has been confirmed at the Savannah River Site, the sprawling nuclear-waste-and-weapons reserve south of Aiken.

The 15th cumulative case was publicized Thursday morning in a brief statement from a U.S. Department of Energy spokesperson. The 14th case was disclosed in a similar fashion earlier this week.

Roughly 10,000 people are employed at the 310-square-mile Savannah River Site. Fewer than 2,500, though, are physically reporting for work amid the coronavirus pandemic, as the site maintains an essential mission-critical posture.

Thirteen site employees who previously tested positive for COVID-19 have recovered, the Energy Department spokesperson said, and have returned to work.

As of Thursday morning, 9,175 cases of COVID-19 had been recorded in South Carolina, including 234 across Aiken, Barnwell and Allendale counties.

Health officials have logged more than 400 virus-related deaths statewide.

Colin Demarest covers the Savannah River Site, the U.S. Department of Energy, the National Nuclear Security Administration and government in general. Follow him on Twitter: @demarest_colin