 AI viruses in their natural reservoir in waterfowl are the source from which novel HA and NA subtypes are introduced into the human population, and have the potential to initiate an influenza pandemic. This study will evaluate the safety and immunogenicity of a live, attenuated, cold-adapted reassortant AI virus vaccine, H9N2 6-2 AA ca Reassortant AchickenHong KongG997 x AAnn Arbor660 ca. 