Vì sao nước Mỹ thiếu vaccine trị cúm?

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U.S. health regulators say they found quality-control problems at a flu vaccine factory in Liverpool, England, in June 2003 but did not begin a full inspection of the plant again until Sunday, five days after British authorities yanked the company's license because of tainted vaccine.

The British regulatory decision cut the U.S. vaccine supply in half.

Food and Drug Administration officials Sunday defended their oversight of the plant, saying that inspections of vaccine plants are normally done every two years, and U.S. officials were not notified until Aug. 25 by vaccine maker Chiron Corp. of more serious problems of bacterial contamination in 6 million to 8 million doses of flu vaccine.