Flu activity increased in five regions: the Northeast, New England, the Middle Atlantic, the Midwest, and the Central states.
Study suggests medical masks may offer similar protecion as N95 respirators, but experts say hold on.
Public health professionals use some terms imprecisely, others incorrectly, and still others technically accurate but almost sure to be misunderstood by the public.
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One expert was skeptical because data are delayed and intermittent.
The passengers will undergo thorough screening by health authorities.
The visit from WHO officials comes as cases in China top 4,000 and deaths surge past 100—and novel coronavirus activity heats up in several countries outside of China.
A top NIH official says symptomatic transmission is likely driving the outbreak.
China's coronavirus outbreak total approaches 3,000 cases.
So far, the number of confirmed US 2019-nCoV cases remains at 5.
Two patients in California and one in Arizona bring the US tally to five 2019-nCoV cases.
China reports 688 new cases today, with the head of the World Health Organization en route.
A new analysis says sustained transmission is fueling the outbreak, which has topped 1,400 cases.
Also, Vietnam reports person-to-person spread as more locations confirm cases.