By Kimberly Kindy and Ceci Connolly The Obama administration is considering an unprecedented fall vaccination campaign that could entail giving Americans three flu shots -- one to combat annual seasonal influenza and two targeted at the new swine flu ...

The Obama administration is considering an unprecedented fall vaccination campaign that could entail giving Americans three flu shots -- one to combat annual seasonal influenza and two targeted at the new swine flu virus spreading across the globe.

The multibillion-dollar effort would represent the first time that top federal health officials have asked Americans to get more than one flu vaccine in a year, raising serious challenges concerning production, distribution and the ability to track potentially severe side effects.

Experts in and out of the administration are evaluating a raft of complicated issues, including who ought to receive an inoculation against the swine flu and whether private vaccine makers can simultaneously manufacture the standard 180 million doses as well as up to 600 million rounds of the new vaccine.

"We are moving forward with making a vaccine," said Robin Robinson, a director with the Department of Health and Human Services who oversees pandemic response programs. Robinson said that although a formal decision about the swine flu vaccine has not been made, if the government goes ahead, it would probably produce two doses for all Americans. If the threat diminishes, he said, health officials could decide to produce doses for only a portion of the population.

Vaccine and pandemic experts are...
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