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Antigenic and genetic analysis of equine influenza viruses from tropical Africa in 1991

Published online by Cambridge University Press:  15 May 2009

C. A. O. Adeyefa ,
M. L. James  and
J. W. McCauley
C. A. O. Adeyefa
Affiliation:
Institute for Animal Health, Pirbright Laboratory, Pirbright, Woking, Surrey, GU24 0NF, UK
M. L. James
Affiliation:
Institute for Animal Health, Compton Laboratory, Compton, Newbury, Berkshire, RG20 7NN
J. W. McCauley*
Affiliation:
Institute for Animal Health, Pirbright Laboratory, Pirbright, Woking, Surrey, GU24 0NF, UK Institute for Animal Health, Compton Laboratory, Compton, Newbury, Berkshire, RG20 7NN
*
†Author for correspondence.
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A detailed analysis of equine (H3N8) influenza viruses isolated in Nigeria during early 1991 has been undertaken. Antigenic analysis and the complete nucleotide sequence of the HA gene of three Nigerian equine influenza viruses A/eq/Ibadan/4/91, A/eq/Ibadan/6/91 and A/eq/Ibadan/9/91 are presented and limited sequence analysis of each of the genes encoding the internal polypeptides of the virus has been carried out. These results establish that, despite the geographical location from which these viruses were isolated, two were similar to the viruses which were concurrently causing disease in Europe in 1989 and 1991 and were related to viruses that have been predominating in horses since 1985. The third was more closely related to viruses isolated from 1991 onward in Europe but also in other parts of the globe. A comparison of the nucleotide sequence of two of the viruses isolated in Nigeria (A/eq/Ibadan/4/91 and A/eq/Ibadan/6/91) with a European strain (A/eq/Suffolk/89) showed limited variation in the haemagglutinin gene which caused amino acid substitutions in one of the antigenic sites: this mutation resulted in the potential production of a new glycosylation site in antigenic site A. The other Nigerian virus (A/eq/Ibadan/9/91) showed only a single one amino acid change from another European strain (A/eq/Arundel/12369/91). The two distinct Nigerian viruses had several amino acid substitutions in the antigenic sites of the haemagglutinin glycoprotein.

Type
Research Article
Information
Epidemiology & Infection , Volume 117 , Issue 2 , October 1996 , pp. 367 - 374
Copyright
Copyright © Cambridge University Press 1996

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