The U.S. will be getting far fewer swine flu shots in October.
Instead of the anticipated 120 million vaccinations, there will only be 45 million available with 20 million more doses shipped weekly.
Of those, pregnant women, health care workers, and children will be top on the list of people eligable to get the shots.
Many manufacturers have had a hard time brewing the vaccine.
The chief ingredient is grown in chicken eggs.
Companies are only getting 30 percent of usual doses per egg as they do with regular winter flu vaccine.
"Because of this delay, it's more likely this virus will cause more illness, more hospitalizations, and even more deaths in this country than we had anticipated," said Dr. William Schaffner with Vanderbilt University Medical Center.
The problem is with the swine flu vaccine, not the regular winter flu shot.
Those inoculations already are beginning in parts of the country, and there is ample supply of seasonal vaccine.