• WATCH: Dr. Richard Besser discusses concerns over Ebola


    CHARLOTTE, N.C. - There is major concern about how a third American contracted the deadly Ebola virus in Liberia.

    Dr. Rick Sacra from the Boston area traveled to Africa after Charlotte missionary Nancy Writebol and Dr. Kent Brantly were diagnosed.

    READ more about the deadly Ebola virus

    Sacra was working in the maternity ward of a general hospital when he was diagnosed with Ebola.

    ABC News chief medical correspondent Dr. Richard Besser said that’s especially concerning.

    “They were screening patients for fever. They were looking for signs of Ebola and they hadn’t seen them. It’s not clear yet how he became infected, but it raises big concerns about the ricks not just in an Ebola setting but in a general hospital,” Besser said.

    WATCH the full interview with Dr. Richard Besser

    Writebol and Brantly received an experimental drug called Z-Mapp that may have contributed to their recover. The drug is in low supply and Sacra will likely not receive it.

    Experts are suggesting an unusual but simple treatment for the outbreak: the blood of survivors.

    Some scientists believe the antibodies in the blood of Ebola survivors could help patients infected with the deadly disease.

    Antibodies are produced by the body’s immune system to fight off harmful things like viruses. They remain in the blood to fight off future infections from the same foreign substance.

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    WATCH: Dr. Richard Besser discusses concerns over Ebola