The World Health Organization has declared that an outbreak of Ebola in Central Africa is a public health emergency. Health ...
The U.S. State Department has issued its highest-level warning, a Level 4: Do Not Travel, for several countries.
The virus circulated undetected for weeks. Heavy population movement in the area could make it spread farther.
The virus's long incubation period is making it difficult for investigators to pinpoint where the infection occurred.
Passengers and close contacts, some with symptoms, are being monitored until not contagious: From Santa Clara, California, to Nebraska, to Emory University in Atlanta.
Officials in several U.S. states are monitoring possible hantavirus exposures. See the map here.
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