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Caption:UNDATED: In this handout from the Center for Disease Control (CDC), a colorized transmission electron micrograph (TEM) of a Ebola virus virion is seen. As the Ebola virus continues to spread across parts of Africa, a second doctor infected with the disease has arrived in the U.S. for treatment. (Photo by Center for Disease Control (CDC) via Getty Images)
Caption:UNDATED: In this handout from the Center for Disease Control (CDC), a colorized transmission electron micrograph (TEM) of a Ebola virus virion is seen. As the Ebola virus continues to spread across parts of Africa, a second doctor infected with the disease has arrived in the U.S. for treatment. (Photo by Center for Disease Control (CDC) via Getty Images)

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    Health worker tests negative for Ebola

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Health worker tests negative for Ebola

A health care worker who recently returned from West Africa has tested negative for the Ebola virus.

Health worker tests negative for Ebola

A health care worker who recently returned from West Africa has tested negative for the Ebola virus.