The 2025 flu season is the worst in over a decade, with record-high infections, hospitalizations, and a rare second peak.

Swine flu vaccines are due to start arriving in the United States next week with high-risk patients first in line, according to Dr. Richard Besser, ABC News' senior health and medical editor.

Studies suggest that people who had seasonal flus or vaccinations have low antibody levels against H5N1 bird flu.

Pigs could play a key role in ending the flu as we know it. That’s the message behind new research testing a computer-designed vaccine that protects swine from flu—and may one day do the same ...

Nonetheless, concerned by that outbreak and witnessing the massive crash vaccine program in the U.S., biomedical scientists worldwide began H1N1 swine influenza vaccine research and development ...

The decision not to get the vaccine, for the most part, did not appear driven by safety concerns. Overall 70 percent of those polled said they think the H1N1 vaccine is safe for most people, 17 ...

November 3, 2009 — H1N1 vaccine supplies are now "on track" to meet target levels, according to data reported today at a Centers for Disease Control and Prevention (CDC) press briefing ...

The recent introduction of oil-in-water emulsions as adjuvants in several pandemic vaccines, such as the H1N1 vaccine, has challenged regulatory authorities to establish their safety in the ...

That’s a new one. Last week, a preliminary Finnish study found that the H1N1 flu vaccine may have contributed to a spike in narcolepsy cases in that country among 4-to-19-year-olds.

Going into the 1976-77 winter season, the world waited – and prepared – for an H1N1 swine influenza pandemic that never came.