Up-to-date information about the H1N1 flu virus that is affecting the population in the U.S. is available at http://www.flu.gov/.
Particularly relevant for early childhood educators is the toolkit for preschool teachers here. This kit includes questions and answers about the flu, fact sheets for parents, a poster, and templates that can be used to write letters to parents about steps they can take.
Also the website features many public service announcement videos about preventing the spread of the flu virus — they are at http://pandemicflu.gov/psa/index.html. Several of the newer videos feature the character Elmo from Sesame Street: "Elmo and Rosita: The Right Way to Sneeze" and "Elmo: Have a Flu Plan" (these are in English and in Spanish).