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Evidence supporting the inclusion of strains from each of the two co-circulating lineages of H3N8 equine influenza virus in vaccines This article is not included in your organization's subscription. However, you may be able to access this article under your organization's agreement with Elsevier. Janet M. Daly, , a, Philip J. Yatesa, 1, J. Richard Newtona, Andrew Parka, b, William Henleya, James L. N. Wooda, Nick Davis-Poyntera and Jennifer A. Mumforda a Centre for Preventive Medicine, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk CB8 7UU, UK b Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK Received 5 February 2004; accepted 27 February 2004. Available online 27 April 2004. Abstract 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 (SRH) antibody levels (i.e. 45–190 mm2) had a higher probability of becoming infected if they were vaccinated with virus heterologous to the challenge strain than if they were vaccinated with homologous virus. Field studies in Thoroughbred racehorses also showed that SRH antibody levels of ≥150 mm2 induced by vaccines containing a European lineage strain are protective against infection with a virus from the same lineage, but that the same or higher antibody levels may not be protective against an American lineage virus. In conclusion, vaccines should contain virus strains representative of both H3N8 subtype lineages to maximise protection against infection. |
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