By REUTERS
Published: May 28, 2009
Companies are starting preliminary work on a vaccine for the H1N1 flu, or swine flu, and should begin clinical trials soon, but the new vaccine will not be ready for widespread use until October, United States health officials said. Dr. Anne Schuchat of the federal Centers for Disease Control and Prevention said the agency shipped virus samples for making vaccines to manufacturers several days ago. Dr. Schuchat said that in coming weeks companies would start making "candidate lots" of vaccine that will be used for clinical trials over the summer
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