DR. JACKSON is chief of pediatric infectious diseases at Children's Mercy Hospital, Kansas City, Mo., and professor of pediatrics at the University of Missouri–Kansas City. Children's Mercy Hospital is currently participating in the H1N1 Child Vaccine study through the National Institutes of Health's Vaccine and Treatment Evaluation Units, and Dr. Jackson is an investigator in the study. E-mail Dr. Jackson atpdnews@elsevier.com.