Last May, as Ebola crept across West Africa, America's top infectious disease expert told a group of Harvard University students in a commencement speech to always second-guess their assumptions because "overconfidence can kill."
A second Texas nurse who has contracted Ebola told a US health official she had a slight fever and was allowed to board a plane from Ohio to Texas, a federal source said on Wednesday, intensifying concerns about the US response to the deadly virus.
US health officials on Friday confirmed the first case of an American infected with a mysterious Middle East virus. The man fell ill after arriving in the US about a week ago from Saudi Arabia where he is a health care worker.
The investigators from the Centers for Disease Control and Prevention successfully used a new tool for the first time — the shopper cards that millions of Americans swipe every time they buy groceries.
Vaccination against the H1N1 swine flu is off to a slow start in the United States, but states have ordered more than 2 million doses of mostly nasal spray for the first patients, a top health official said on Tuesday.