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Between March and May 2003, clinical equine influenza was confirmed among vaccinated racehorses in Newmarket, UK. A particular feature was that 2-year-old horses were apparently less susceptible than older animals. Statistical analyses comparing infected and non-infected animals showed the unusual, apparently counter-intuitive inverse age effect was principally explained by more recent vaccination...
Several laboratories worldwide have recently experienced problems related to serum cytotoxicity with the equine arteritis virus (EAV) neutralisation test (VN) when using Office International des Epizooties (OIE) reference laboratory prescribed rabbit kidney (RK-13) indicator cells. Cytotoxicity can be mistaken for viral cytopathic effect and has led to increasing difficulties in test interpretation,...
Two lineages of antigenically distinct equine influenza A H3N8 subtype viruses, American and European, co-circulate. Experiments were conducted in ponies to investigate the protection induced by vaccines containing virus from one lineage against challenge infection with homologous or heterologous virus. Regression analysis showed that vaccinated ponies with average pre-challenge single radial haemolysis...
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