Swine flu coverage

In the second such recall this season, manufacturer MedImmune says the vaccine has lost potency since it was made. ‘This is not a safety issue,’ a U.S. official says.

A study in California shows that about a quarter of the people hospitalized for H1N1 complications were morbidly obese, even though less than 5% of the population falls into that category.

Humans have it. Pigs don’t.

Surgical masks help stop droplets from spreading, but respirators are designed to filter small particles. If used correctly, respirators are more likely to reduce flu risk, the CDC says.