Two American aid workers infected with Ebola while caring for patients amid the outbreak in West Africa have significantly improved after receiving an experimental serum. The monoclonal antibody serum, produced by Mapp Biopharmaceutical, had never been used in humans, but it did show positive effects in monkeys infected with Ebola. Experts urged caution, saying that few conclusions can be drawn from two cases. Meanwhile, physicians at Mount Sinai Hospital in New York were handling a possible Ebola case with care, although they say it is "unlikely" the patient has the deadly virus.

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