The Centers for Disease Control and Prevention today reported widespread flu activity in 43 states, down from 46. Anne Schuchat, M.D., director of the CDC's National Center for Immunization and Respiratory Diseases, said about 54.1 million doses of H1N1 flu vaccine have been made available as of this week, of which more than 44 million have been shipped to states. About half of the doses have gone to children, Schuchat said. As the holiday travel season approaches, the CDC has launched a flu prevention campaign encouraging people to travel only when well, wash their hands often, cover coughs and sneezes, and get vaccinated if recommended. For more information, visit www.cdc.gov/h1n1flu.