Beds are lining Spanish hospital corridors after a flu virus continues to spread across the country. Influenza A cases are ...

In 1918, a strain of influenza known as Spanish flu caused a global pandemic, spreading rapidly and killing indiscriminately. Young, old, sick and otherwise-healthy people all became infected — at ...

Cases of a respiratory virus that causes flu-like symptoms are surging in China, raising plenty of questions about what this ...

The CDC says the risk of bird flu to the general public is low, but public health experts say they are worried the virus could mutate and become more transmissible.