Health officials are making a renewed call for vigilance against bird flu​, but some experts are puzzling over why reports of new human cases have stopped.

As bird flu sweeps across US poultry and cattle farms, researchers are racing to find ways to contain the outbreaks before they ignite a human pandemic. Now, a team of scientists has developed a fresh approach: the first mRNA bird-flu vaccine for cattle.

Health officials are making a renewed call for vigilance against bird flu, but some experts are puzzling over why reports of new human cases have stopped.

CSU researchers work to determine how the virus is spreading Last spring, when the U.S. Department of Agriculture announced that an outbreak of highly pathogenic avian influenza, commonly referred to as bird flu,

Bird flu has killed over 166 million birds worldwide and is now spreading to other animals, including cows, and more concerningly, cats.

Over a 14-month period, 70 people in the US were confirmed to have bird flu. But since early February, the number of new diagnoses stands at zero—leaving experts to question why reports of new human cases have essentially stopped.

The first major global review of bird flu in cats reveals an emerging threat of a potential human pandemic. Spring is here, birds are on the move, and a new threat is spreading alongside them: bird flu (H5N1).