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A turkey rhinotracheitis outbreak caused by the environmental spread of a vaccine-derived avian metapneumovirus

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Avian metapneumovirus (aMPV) subtype A was isolated from 7-week-old turkeys showing respiratory disease typical of turkey rhinotracheitis. Comparison of the virus sequence with previously determined vaccine marker sequences showed that the virulent virus had originated from a licensed live subtype A aMPV vaccine. The vaccine had neither been in use on the farm within a period of at least 6 months nor had it been used on farms within a distance of approximately 5 km. Isolation of the virus and exposure to naive turkeys caused disease typical of a virulent aMPV field strain. The study shows that disease was caused by exposure to aMPV vaccine-derived virus that was present in the environment, and indicates that such virus is able to circulate for longer than was previously envisaged.
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Document Type: Research Article

Affiliations: 1: Dipartimento di Scienze Mediche Veterinarie,Alma Mater Studiorum—University of Bologna, Via Tolara di Sopra 5040064Ozzano EmiliaBO, Italy 2: Dipartimento di Sanità Pubblica, Patologia Comparata e Igiene Veterinaria,Faculty of Veterinary Medicine, University of Padua, Viale dell'Università 1635020LegnaroPD, Italy 3: Department of Infection Biology, Institute of Infection and Global Health,Faculty of Health and Life Sciences, Leahurst Campus, University of Liverpool, LiverpoolCH64 7TE, UK

Publication date: October 1, 2011

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