Christian Neidel, 4, a student at Newcastle Elementary School in Newcastle, Okla., right, receives a dose Oct. 7 of the 2009 H1N1 flu nasal spray vaccine from nurse Joey Reese during a health clinic at the school. Schools across the nation have been closing due to a high number of children absent with flu-like symptoms. The closures come amid warnings from the government that schools should only close as a last resort. More than 120,000 students in 19 states have been affected by the closures. AP Photo/Sue Ogrocki
