Bird Flu Vaccine Has Flaws

(AP) -- The nation's first vaccine against bird flu is only modestly effective, producing apparent protection in slightly over half the people who receive two mega-dose shots, initial testing shows. The worrisome findings underscore the urgency of brewing a better vaccine.

The government had signaled that this vaccine had serious flaws even as it ordered $162 million worth of shots last summer to stockpile in case the bird flu mutated to spread easily from person to person.