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CHARLOTTE, N.C. — Another missionary doctor has tested positive for the Ebola virus, SIM USA reported Tuesday.

The American doctor was treating obstetrics patients at SIM’s ELWA hospital in Monrovia, Liberia. It is not yet known how the doctor contracted the virus specifically.

The doctor immediately isolated himself and has since been transferred to the ELWA Ebola isolation unit. The doctor is reportedly doing well and is in good spirits.

“My heart was deeply saddened, but my faith was not shaken, when I learned another of our missionary doctors contracted Ebola,” said Bruce Johnson, president of SIM USA. “As a global mission, we are surrounding our missionary with prayer, as well as our Liberian SIM/ELWA colleagues, who continue fighting the Ebola epidemic in Liberia. We have gifted Liberian doctors, medical staff and support staff who are carrying on the fight.”