Early results from a trial testing of a 2009 H1N1 influenza vaccine in children look promising, according to the trial sponsor, the National Institute of Allergy and Infectious Diseases (NIAID).  Preliminary analysis of blood samples from a small group of trial participants shows that a single 15-microgram dose of a non-adjuvanted 2009 H1N1 influenza vaccine—the same dose that is in the seasonal flu vaccine—generates an immune response that is expected to be protective against 2009 H1N1 influenza in the majority of 10 to 17-year-olds eight to ten days following vaccination. These results are similar to those recently reported in clinical trials of healthy adults. Younger children generally had a less robust early response to the vaccine. For more information, see the NIAID’s Web portal at http://www3.niaid.nih.gov/.