Antibodies to the highly pathogenic H5N1 avian influenza virus were found in the blood of three veterinarians out of 150 who work with cattle and agreed to have their blood tested, reports the CDC.

Prior exposures to specific types of seasonal influenza viruses promote cross-reactive immunity against the H5N1 avian ...

Previous exposures to older flu strains prime the immune system to produce antibodies against bird flu (H5N1).

Very few humans have gone up against bird flu. But we've all dealt with seasonal flu for years. Some of our immune systems ...

Older adults who were exposed to seasonal flu viruses that circulated prior to 1968 are more likely to have some protection ...

Early flu exposure helps immunity against H5N1 infection, with older adults having stronger antibody responses.

Amid the outbreak of measles in West Texas, there's a question of how contagious the disease is—and whether it will spread in ...

New research suggests that past exposure to seasonal flu viruses may help protect people from severe illness caused by the ...