Swine flu is causing unprecedented illness for so early in the fall -- including a worrisome count of child deaths -- and the government warned Friday that vaccine supplies will be even more scarce than expected through this month.
Federal health officials said 11 more children have died in the past week because of the virus.
Manufacturer delays mean 28 million to 30 million doses, at most, will be spread around the country by the end of the month. That means flu-immunization clinics in some parts of the country may have to be postponed.
Meanwhile, preliminary tests show three pigs in Minnesota may have contracted the swine flu virus, making them the first potential U.S. cases in swine, agricultural officials said. They stressed that he finding does not threaten food safety.