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  • Title: A turkey rhinotracheitis outbreak caused by the environmental spread of a vaccine-derived avian metapneumovirus.
    Author: Lupini C, Cecchinato M, Ricchizzi E, Naylor CJ, Catelli E.
    Journal: Avian Pathol; 2011 Oct; 40(5):525-30. PubMed ID: 21854180.
    Abstract:
    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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