Another US Doc Has Ebola Unnamed doctor was working in missionary group in Liberia By Polly Davis Doig, Newser Staff Posted Sep 2, 2014 12:32 PM CDT 40 comments Comments Bruce Johnson, president of SIM USA, speaks in Atlanta on Tuesday, Aug. 5, 2014, saying that aid worker Nancy Writebol is showing "signs of progress" after being infected with Ebola. (AP Photo/Alex Sanz) (Newser) – 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."