The mutated strain, known as subclade K, is causing a surge in cases in the United Kingdom, Canada, and Japan. Here's what to know.

When should you get your flu shot? Flu season typically starts in December and peaks in February, so the "optimal time" to get vaccinated is heading into the season, Dr. Céline Gounder, CBS News ...

After a rough, record-setting flu season, doctors and health officials are bracing for another wave of fever, misery and respiratory distress. In the U.K., health officials are warning about an early ...

Influenza -- always an unwelcome guest -- arrived early in Connecticut and is staying late. "Here it is early spring and we're still smoldering along," Dr. Randall Nelson, epidemiologist with the ...