For DTaP and Tdap, they include Moderate or severe acute illness with or without fever (vaccination is postponed until illness resolves if possible) Guillain-Barré syndrome within 6 weeks after a previous dose to a vaccine containing tetanus toxoid For the pertussis component only: A progressive or unstable neurologic disorder, uncontrolled seizures, or progressive encephalopathy (vaccination is postponed until a treatment regimen is established and the disorder is stabilized) For DTaP only, precautions include A seizure, with or without fever, within 3 days after a previous dose of DTaP ≥ 3 hours of persistent, severe, inconsolable screaming or crying within 48 hours after a previous dose of DTaP Collapse or shock-like state (hypotonic hyporesponsive episode) within 48 hours after a previous dose of DTaP Temperature of ≥ 40.5° C, unexplained by another cause, within 48 hours after a previous dose of DTaP For Tdap only, precautions include History of type III hypersensitivity reactions after a previous dose of a vaccine containing tetanus or diphtheria toxoid (vaccination is postponed ≥ 10 years since the last dose of tetanus toxoid - containing vaccine) Dose and Administration The dose for DTaP or Tdap is 0.5 mL IM.