Note to Trainers and Handlers – Changes to Equine Influenza vaccination intervals/Rule 91



The Irish Horseracing Regulatory Board have today confirmed that changes to the primary course and booster schedule for Equine Influenza (EI) will come into effect on 1st January 2022 following previous approval from the European Horseracing Scientific Liaison Committee (EHSLC).


Following consultation with experts in Equine Influenza from Ireland, Great Britain, France, EHSLC members and Trainers’ representative bodies, the EHSLC Board approved changes to the primary course and booster schedule for EI in December 2019 with the objective to harmonise the policy across Europe. These changes, which were due to come into effect from January 2021 in line with the British Horseracing Authority and France Galop, were subsequently delayed due to the Covid-19 pandemic.


The IHRB and BHA have this week confirmed amendments to their rules from 1st January 2022 with this lead in time intended to give Trainers and Handlers to make the change with as little disruption to their racing plans as possible. These changes were implemented in France and Germany since 5th May 2021.


From 1st January 2022, the primary course and booster schedule for Equine Influenza (EI) vaccinations will be amended as follows:




V1 - V2

21 – 92 days

21 – 60 days

V2 - V3

150 – 215 days

120 – 180 days


Not more than 1 year apart

Not more than six months apart


Further details of how this staged approach with the prolonged lead-in will work are given below.




Primary course intervals


Six-monthly boosters


EHV Vaccinations

There is no requirement for the administration of EHV Vaccinations under the IHRB Rules of Racing. This is reviewed on a regular basis by the IHRB Veterinary Committee.