(HealthDay News) — Another American doctor working in West Africa for a missionary group has become infected with the Ebola virus.

The missionary group, Serving In Mission (SIM), said Tuesday that the unidentified doctor had been treating women in the obstetrics ward of a hospital in the Liberian capital. It’s not clear how the doctor contracted the virus because the ward is separate from the part of the hospital where Ebola patients are treated, the Associated Press reported.

Last month, two American health care workers, including one with SIM, were infected with Ebola in Liberia and evacuated to Emory University Hospital in Atlanta. They recovered after aggressive treatment that included the experimental drug known as ZMapp. The manufacturer says it has run out of supplies of the drug and it will take months to produce more, the AP said.

Also Tuesday, the U.S. National Institutes of Health (NIH) said the first human tests of an experimental Ebola vaccine are set to start this week. The vaccine, which the NIH is developing with drug company GlaxoSmithKline, has “performed extremely well” in primates, but hasn’t yet been tested in people, Anthony Fauci, MD, director of the U.S. National Institute of Allergy and Infectious Diseases, said in a statement, ABC News reported.

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