A missionary group says another American doctor has contracted the Ebola virus while working at a hospital in Liberia. 
 
 In a statement issued Tuesday, Serving In Mission said the unnamed doctor had been treating women in the obstetrics ward of a hospital in the Liberian capital. 
 
 The group doesn't know how the doctor contracted Ebola since the ward is separate from the area where Ebola patients are being treated. 
 
 Last month two Americans, including one from SIM, were evacuated to the United States for treatment after contracting Ebola in Liberia. 
 
 The two received an experimental drug known as ZMapp and recovered from Ebola. The manufacturer says it has run out of supplies of the drug and it will take months to produce more. 
 
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 Another American missionary doctor working in Liberia has tested positive for Ebola, an aid group said Tuesday. 
 
 SIM USA said the doctor, who was not named, was treating obstetric patients at ELWA hospital in Monrovia and had not treated Ebola patients in the hospital’s isolation unit, which is separate from the main hospital. The charity said it was not yet known how the doctor was infected, but he immediately isolated himself when he showed symptoms. 
 
 The new case comes two weeks after Dr. Kent Brantly and his colleague Nancy Writebol, who worked for SIM, walked out of an Atlanta hospital virus-free after being infected and evacuated from Liberia. 
 
 The doctor was transferred to the Ebola isolation unit and is doing well and in good spirits, SIM said in a statement. The group planned a briefing later Tuesday. 
 
 “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.” 
 
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 IN-DEPTH 
 
 -Lisa Tolin
– A second American doctor working in Liberia has tested positive for Ebola, missionary group Serving in Mission USA is confirming, as per the AP. It's not clear how the doctor, who was not named, contracted the virus: He was working in an obstetrics unit in a Monrovia hospital, and not in the isolation unit. He immediately isolated himself and is said to be doing well, reports NBC. SIM USA's president, Bruce Johnson, said in a statement: "My heart was deeply saddened, but my faith was not shaken, when I learned another of our missionary doctors contracted Ebola. 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."