Research Article
Thermostability Profile of Newcastle Disease Viruses Isolated from Wild Birds in Central Nigeria and the Selection of a Thermostable Clone from the Sub-Population

O.J. Ibu, J.O.A. Okoye, S.S. Baba, S.V.O. Soyinka, K.F. Chah, J. Antiabong, D. Eze, E.A. Salihu and S.B. Oladele

International Journal of Poultry Science, 2010, 9(8), 791-794.

Abstract

The study was carried out to assess the Haemagglutinin thermostability of Newcastle disease virus isolates obtained from wild birds in three climatically distinct states in central Nigeria. Identification of heat stable ND virus isolates from the locality will provide environmentally friendly thermostable vaccine candidates for rural poultry. The 12 field virus isolates and the 5 vaccine virus strains showed variable degrees of heat stability. Three field isolates each was inactivated in 5 min, three in 10 min and one in 15 min. One isolate was inactivated in 20 min while two and three strains got inactivated in 25 and 30 min respectively. The most thermostable of the field isolates was inactivated in 40 min. A more thermostable clone was subsequently derived from the latter strain as a local vaccine candidate. For the vaccine strains, NDV (I/O) and NDV (K) were inactivated in 20 min while NDV (L) was inactivated in 25 min. The velogenic strain (Herts) was inactivated in 40 min. The two established thermostable strains, NDV4 and NDVI2 were inactivated in 90 min each. The thermostable profile of the field virus strains did not vary with the climatic background of the isolates.

ASCI-ID: 101-1434

Cited References Fulltext

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