united states

A health care worker who tested positive for Ebola flew on a plane the day before she developed symptoms of the deadly disease, the Centers for Disease Control and Prevention announced today.

A second health care worker in Dallas has tested positive for Ebola after caring for a patient who had the disease, the Centers for Disease Control and Prevention said today.

Health officials are making immediate enhancements to improve safety at U.S. hospitals treating Ebola patients after a nurse became infected with the virus.

A second person in Dallas has tested positive for Ebola after coming in contact with a man from Liberia who was infected with the deadly virus, officials said today.

Despite reassurances from health officials that Ebola is unlikely to spread in the United States, concerns about the disease in this country have grown. Why does Ebola scare us?

If the Ebola outbreak in West Africa is not stopped now, hundreds of thousands of people in the region could be infected with the deadly virus, President Obama said today.

A new map shows the path of H1N1 "swine flu" as it spread across the United States in the fall of 2009, when the brunt of the pandemic hit the country.

A second case of a relatively new and deadly virus known as Middle East Respiratory Syndrome Coronavirus has been reported in the United States, the CDC said.