The standard course of immunization for healthy children is three doses of DPT (diphtheria-tetanus-pertussis) preparation given between two months and six months of age, with booster doses given at 18 months and at entry into school.
DPT vaccine has been associated with allergic reactions and with encephalopathy, both of which are rare but severe conditions.
"Adverse events after immunization with aluminum-containing DPT vaccines: systematic review of the evidence."
"Whooping Cough, the DPT Vaccine, and Reducing Vaccine Reactions."
The cavalry includes a squadron of royal horse guards, 28 regiments of the line, remount and dpt establishments, 4 regional squadrons in Majorca, the Canaries, Ceuta, Melilla.