May 6, 2009 -- If there's an H1N1 swine flu pandemic, vaccine makers should be able to churn out "at least" 1 billion to 2 billion doses of H1N1 swine flu vaccine, the World Health Organization (WHO) estimates.
The WHO hasn't yet declared an official pandemic. But given the growing number of cases worldwide -- as of Wednesday, 1,658 confirmed cases in 23 nations -- acting CDC Director Richard Besser, MD, says it would be surprising if an official pandemic was not eventually announced.