Pre-existing immunity against seasonal H1N1 flu might help explain why most reported human cases of H5N1 bird flu in the U.S.

They found that blood samples from older adults born prior to 1968 who were likely first exposed to H1N1 or H2N2 in childhood had higher levels of antibodies that could bind to the H5N1 virus.

Antibodies directed against the stalks of H1N1 viruses can cross-react with H5N1, likely indicating some protection against severe disease. Sponsor Message.

In two recent interviews on Fox News, HHS Secretary Robert F. Kennedy Jr. downplayed concerns about H5N1 avian influenza in the U.S., raising alarm among public health and infectious disease ...

If H5N9 gains a foothold in humans, people may possibly have less immunity to the virus than they do to H5N1. "The seasonal, human H1N1 virus has an NA protein that is related, but different from ...

When, where and how the H5N1 bird flu virus may evolve and its capacity to spark a pandemic is hard to predict — in part, some researchers say, because of federal restrictions on gain-of ...

Illustration of milking unit surfaces tested in a study of persistence of influenza H5N1 and H1N1 viruses in unpasteurized milk. Before attaching the milking unit (claw), a dairy worker disinfects ...

Cases of H5N1 bird flu in U.S. dairy and poultry workers have largely been mild. But a new case in a British Columbia teenager has experts worried.

H5N1 bird flu detected in a pig for the first time, raising concerns. Leah Douglas and Tom Polansek. REUTERS. ... Pigs were the source of the H1N1 flu pandemic in 2009-2010, ...

H5N1 bird flu has been identified in a pig in the United States for the ... The 2009 H1N1 flu pandemic is believed to have been sparked by a virus that mutated in pigs in Mexico before it jumped ...

Pre-existing immunity against seasonal H1N1 flu might help explain why most reported human cases of H5N1 bird flu in the U.S. have not resulted in lethal outcomes.