- Receipt or planned administration of a nonstudy vaccine within 30 days prior to vaccination and during the study, including licensed influenza vaccines. Immunization on an emergency basis with Tetanus Toxoid Adsorbed for adult use (Td or Tdap) up to 8 days before or at least 8 days after a dose of study vaccine will be allowed. Administration of study vaccine injection can be delayed if a nonstudy vaccine has been administered and will be given as soon as acceptable, as described above, provided the vaccine is not administered within two weeks prior to study enrollment.