The cruise ship outbreak has put renewed attention on the Andes virus, a rare type of hantavirus that can spread between people and cause severe respiratory illness.
This flu season seems to be getting worse by the day, according to health officials. The bulk of this year's cases are being linked to a new variant known as subclade K.
New York City is seeing some of the highest levels in the country.
Concerns about the spread of influenza are growing in the U.S. as the U.K. sees a flu surge in children and young adults.
A federal vaccine advisory committee voted on Friday to end the longstanding recommendation that all U.S. babies get the hepatitis B vaccine on the day they're born.
A federal vaccine advisory committee voted to delay a decision on whether newborns should still get the hepatitis B vaccine on the day they're born.