To date, human infections have been rare and are typically linked to direct contact with animals. Sustained human-to-human transmission has not occurred, and health officials say the overall pandemic ...

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 ...