Health & Medicine

Swine flu source

Anchor Marco Werman speaks with Ellen Silbergeld, professor of environmental health sciences at Johns Hopkins School of Public Health, about what scientists know so far about the swine flu virus, or "Influenza AH1N1." Some think industrial-size pig farms in Mexico may have played a role in creating the virus.

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(This story is based on a radio interview. Listen to the full interview.)

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