KEY
  For all persons in this category who meet the age requirements and who lack evidence of immunity (e.g., lack documentation of vaccination or have no evidence of prior infection)
  Recommended if some other risk factor is present (e.g., on the basis of medical, occupational, lifestyle, or other indications)
Tdap recommended for ≥65 if contact with <12 month old child. Either Td or Tdap can be used if no infant contact
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