Evaluating the Safety and Immunogenicity of a H7N9 Vaccine for the Prevention of Influenza H7N9 Disease in Adults 50 to 70 Years Old

Inclusion Criteria: * Adult males and non-pregnant females between 50 years and 70 years of age inclusive. Children will not be recruited or enrolled in this study because they are not in the apparent risk group, and for safety considerations and because of the need for isolation. * Are in good health, as determined by medical history and targeted physical examination to ensure any existing medical diagnoses or conditions (except those exclusionary) are stable. More information on this criterion can be found in the protocol. * Agree to storage of blood specimens for future research * Available for the duration of the trial. Participants must be willing and able to remain within the Isolation Unit for the specified duration of confinement. * Willingness to participate in the study as evidenced by signing the informed consent document * Female participants of child-bearing potential must agree to use effective birth control methods for the duration of the study (for example, pharmacologic contraceptives including oral, parenteral, and transcutaneous delivery; condoms with spermicide; diaphragm with spermicide; intrauterine device; abstinence from heterosexual intercourse; surgical sterilization). All female participants will be considered being of child-bearing potential except those who have undergone hysterectomy and those in whom menopause occurred at least 1 year prior to the study. * Agrees not to participate in another clinical trial with an investigational product for t…