About 50,000 children are hospitalized annually.

There have been dozens of reports of Pacific Crest Trail hikers in Southern California falling ill to a highly contagious ...

Bird Flu Outbreak in California Elephant Seals Prompts Officials to Cancel Popular Tours Researchers say seven seal pups have tested positive for an avian flu virus at California’s Año Nuevo State ...

An avian flu outbreak centered at California’s Año Nuevo State Park is spreading, with new cases detected in elephant seals, a southern sea otter and a sea lion — a spread that has implications for ...

Dozens of hikers have fallen ill while on California section of the 2,650-mile Pacific Crest Trail, authorities said.

If you notice that your office is emptying out, chances are it’s because a respiratory virus that few people have actually heard of is circulating throughout Northern California. Dr. Monica Gandhi, an ...

Close-up portrait of a Southern Elephant Seal (Mirounga leonina) showing detailed textures of its face and skin during molting season in the Falkland Islands.© Giedriius/Shutterstock.com Avian ...

Moderna’s mRNA flu vaccine gave more protection against illness than the standard flu shot in a phase 3 clinical trial, according to published results.