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Experts also found no evidence that regular flu vaccines offer any protection against swine flu.
They estimated that under the best conditions, drug companies could produce nearly 5 billion doses of swine flu vaccine in the year after beginning full-scale production.
One expert, however, thought the 5 billion dose estimate was too optimistic.
"We should go forward with production as quickly as possible, but we should be cautious" about predictions, said David Fedson, a vaccine expert and former medical professor at the University of Virginia.
Chan has warned that it would be impossible to produce enough vaccine for all 6.8 billion people on the planet.
In any case, mass producing a pandemic vaccine would be a gamble, as it would take away manufacturing capacity for the seasonal flu vaccine that kills up to 500,000 people each year. Some experts have wondered whether the world really needs a vaccine for an illness that so far appears mild.
U.S. Health and Human Services Secretary Kathleen Sebelius said Tuesday the U.S. felt it had a responsibility to ensure that both antiviral drugs and any new vaccine are also available to poor countries. The United States has so far refrained from reserving any new vaccine.
Sebelius said the United States is working to boost its production capacity for seasonal flu vaccines so those factories could switch to the pandemic swine flu strain if needed.
"At this point we have not placed orders for vaccine," Sebelius told reporters in Geneva. "There is still so much uncertainty about this virus that it is really premature for us to even make a determination of how many people would appropriately be vaccinated, in what order, how many doses would be required."
[Associated
Press;
Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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