(WCNC) - A Charlotte, North Carolina woman who contracted the deadly ebola virus in Liberia had served as a missionary overseas with her husband for more than a dozen years, according to her pastor.

David and Nancy Writebol are missionaries for Charlotte-based S.I.M., a mission group that works with Samaritan's Purse in the Liberian capital of Monrovia.

Dr. John Munro, senior pastor at Calvary Church in south Charlotte, said Sunday that the church has sponsored the Writebol's missionary work since the 1990s.

"We are privileged to serve with them," said Dr. Munro. "They are an outstanding Christian couple."

Munro said he spoke to David Writebol, who relayed that his wife's condition was "grim."

Nancy Writebol is in stable condition, according to Samaritan's Purse spokesman Ken Isaacs. She is being treated with IV fluids, pain relievers, and anti-inflammatory drugs. She is isolated, and her husband is being monitored but has not shown any symptoms of the disease, said Isaacs.

Writebol had been working most recently as a hygienist at the hospital unit treating Ebola patients, said Isaacs.

Although she did not have direct contact with patients, her job was to decontaminate medical workers who treated them.

Read more at WCNC’s website.