Americans who have high-risk exposures to Ebola in the current outbreak in Central Africa will have access to an antibody treatment that has shown great promise in animal testing but hasn’t yet undergone a clinical trial to show whether it is efficacious in people, the Department of Health and Human Services confirmed Thursday.

The antibody treatment, known as MBP-134, is made by San Diego-based Mapp Biopharmaceuticals, with funding from the Biomedical Advanced Research and Development Authority, an agency within HHS that helps develop medical countermeasures for rare and emerging diseases, and biological threats.

It is not clear how many doses of MBP-134 exist at present. STAT asked the company and was told Mapp Bio could not reveal the number because BARDA owned the doses.

An American doctor who contracted Ebola in the outbreak zone was flown last month to Germany for care; his wife, also a doctor, and their four children were also taken to Germany for quarantine. The ill physician, Peter Stafford, remains in care but is reportedly recovering. Another doctor from the same Christian missionary group who had what was considered a high-risk exposure is in quarantine in the Czech Republic; he remains healthy. There are currently no other known exposures among Americans.