Doctors are closely watching a new flu variant, known as Subclade K, which has affected people in Japan and the United Kingdom. While it’s too early to know how it will impact the U.S., last season’s ...

In 1918, a flu pandemic caused by a strain of H1N1 infected 500 million people worldwide. It was known as the Spanish flu, and at least 50 million people died.

Jamaica is seeing an outbreak of leptospirosis and is urging anyone who is experiencing symptoms from the infectious disease ...

As families gather for Thanksgiving, here's what to know to protect your family from the new subclade K flu strain.

The person, who had been hospitalized in King County since early November, died on Nov. 21, health officials said.

One person had died from the disease. In early January, a backyard flock keeper hospitalized with bird flu in Louisiana ...

Health officials in Illinois are warning of a new and unexpected mutation that could make for a "more serious flu season" as ...

The United States may be headed for a rough flu season, with a virus that causes more severe symptoms than the one last year ...

The emergence of a new, mutated flu strain, H3N2 subclade K, has caused several outbreaks abroad, and some cases have been ...

Learn how long the flu lasts, what symptoms occur at every stage, and what you can do to feel better and lower the risk of ...