NEW YORK (Reuters Health) - Our ever-expanding waistlines may have outgrown the doctor's needle, researchers say, in what could be another casualty of the obesity epidemic. In a new study, the researchers report that using a standard 1-inch needle to immunize obese adolescents against hepatitis B virus produced a much weaker effect than using a longer needle. "As obesity rises ...

WASHINGTON (Reuters) - H1N1 swine flu is still circulating around the world and still killing people, although it is on the decline everywhere, global health officials said on Friday. The H1N1 strain is the dominant form of influenza globally, but some seasonal strains are starting to emerge in China and Africa, the World Health Organization reported. The United States remains one ...

If the U.S. swine flu epidemic isn't over, it certainly looks as if it's on its last legs. While federal health officials are not ready to declare the threat has passed and the outbreak has run its course, they did report Friday that for the fourth week in a row, no states had widespread flu activity. U ...