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

In other vaccine news, Health Secretary Robert F. Kennedy Jr. has officially ordered placebo testing on new vaccines, a change that experts claim will be costly and — harkening back to polio vaccine ...

Health officials urge caution about bird flu. Experts are unsure why human cases stopped. H5N1 spread among birds, cows, and ...

Agencies do not have unfettered power to further a president's agenda,” U.S. District Judge Mary McElroy ruled Friday.