Veterinary advice on new strain of Rabbit Viral Haemorrhagic Disease

A new strain of Rabbit Viral Haemorrhagic Disease has been identified in rabbits in the UK. The British Veterinary Association (BVA), British Small Animal Veterinary Association (BSAVA) and British Veterinary Zoological Society (BVZS) are issuing the following advice for practices who may not be familiar with the recent developments of this disease: Rabbit Viral Haemorrhagic Disease variant (RVHD2) is a variation of the already recognised Rabbit Viral Haemorrhagic Disease (RVHD1). BVA, BSAVA and BVZS are working with animal welfare organisations and owners to ensure rabbits are protected against this potentially devastating disease. Vaccines for the original strain of RVHD do not appear to offer long term protection against RVHD2, however vaccines for this new strain are now available in the UK and can be purchased through three UK wholesalers (NVS, Centaur and Henry Schein Animal Health) or direct from the suppliers in Europe. There have been supply issues with this vaccination, however these are hoping to be remedied soon. RVHD2 is more variable in its rate of disease progression than RVHD1, with presentation ranging from sudden death (with or without bleeding from the orifices), to a longer disease course of three to nine days, increasing the risk of unwell rabbits being brought into practices and in turn increasing the risk of transmission to other pet rabbits. Until vaccination becomes more routine, biosecurity in practices is key to prevent the disease from spreading. Sean Wensley, BVA President, said: “Although the risk of a rabbit contracting RVHD2 appears highest in situations where rabbits are kept in large groups with regular new additions, such as at breeders or rescue centres, we encourage all owners to speak to their vet about vaccinating their rabbits against RVHD2. "Veterinary advice from The Rabbit Welfare Association and Fund (RWAF) has stated that the spread of RVHD2 may be facilitated by its apparent slower disease progression compared to RVHD1, and research suggests that we can expect to see RVHD2 starting to predominate in the UK’s wild rabbits over RVHD1 in the next five years or so.” John Chitty, BSAVA Vice President, commented: “BSAVA would encourage practices to talk to rabbit owning clients about RVHD2 vaccines, and where there is deemed sufficient risk recommend the vaccine along with the essential vaccination against Myxomatosis – and it should be noted that this must not be done within two weeks of vaccination against RVHD2.” BVZS President and veterinary pathologist Mark Stidworthy said: “It is clear from post mortem examinations and PCR testing over the last 18 months that RVHD2 is now geographically widespread in the UK and all rabbits should be considered at risk from this potentially devastating disease.” Due to recent media coverage of RVHD2, vets may be contacted by concerned owners seeking advice on how to prevent their rabbits contracting this disease - further to vaccinating, vets should recommend rabbits are kept separate from any other rabbits they do not usually interact with; are prevented from having contact with wild rabbits and do not attend any rabbit shows unless already vaccinated. For a detailed Q&A on RVHD2 from Richard Saunders MRCVS, veterinary advisor to the RWAF, including information on sourcing effective vaccines, visit www.rabbitwelfare.co.uk and click RVHD2 - Filavac Vaccine – FAQs on the home page.