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U.S. trials of Sanofi- Pasteur SA's and CSL Ltd's H1N1 swine flu vaccines confirm that only one dose is needed to protect people, U.S. health officials said on Friday.
"The United States hopes to vaccinate 160 million Americans considered at highest risk of death or severe disease by the beginning of December. These include pregnant women, people with asthma, diabetes or heart disease and children and young adults."