WASHINGTON (Reuters) - Five drug companies are now increasing production of the vaccine for the H1N1 swine flu, and 10 million more doses are expected next week, Health and Human Services Secretary Kathleen Sebelius said on Saturday. President Barack Obama on Friday expressed frustration about the slow pace of production of the vaccine, which has resulted in just 26.6 million doses as of Friday, far below earlier estimates of 40 million by the end of October. Sebelius said those initial estimates were based on "overly optimistic" predictions by the five contracted vaccine makers for the U.S. market -- MedImmune, a unit of AstraZeneca, Sanofi-Aventis, Australia's CSL, GlaxoSmithKline and Novartis. But production was now increasing and vaccine doses were being shipped seven days a week, Sebelius told CNN. "The good news is that we have, as of yesterday, 26.6 million doses out and around the country. We are expecting another 10 million doses next week," Sebelius said. "So the vaccine is beginning to roll in larger volumes.[Read more...]