"To handle the groups at risk will take 300 or 400 thousand doses in the first wave," Duval County Health Department director Dr. Bob Harmon tells WOKV. "And we hope to immunize even more than that."

Harmon recommends several hundred thousand doses for Jacksonville if H-1-N-1 cases spike in the fall. But federal health officials warn the nation's stockpile of H-1-N-1 vaccines will likely be delayed because of slowed-production.

Health and Human Services officials hoped to have 120 million swine flu shots stockpiled by mid-October, but now say it's more likely only a third of those doses are ready to be doled out to local health departments by then and the bulk of H-1-N-1 vaccines won't be ready until November.

"The majority of cases of swine flu are going to be occuring in early fall," University of Florida emerging pathogens professor Dr. Glen Morris warns. "But the vaccines will be showing up in late fall. So we're going to have to kind of play it by ear, and hope we don't get hit with a large number of cases before the availability of vaccines."

Seasonal flu vaccines will not be in short supply when the flu season starts in October, but Morris says that vaccine, while recommended, does little to prevent the spread of the H-1-N-1 virus.

"We are having an event right now," Harmon says. "And we have to take steps to prevent it from becoming worse."