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Volume 18, Number 10—October 2012


Spread of Influenza Virus A (H5N1) Clade to Bulgaria in Common Buzzards

Atanaska Marinova-Petkova, Georgi Georgiev, Patrick Seiler, Daniel Darnell, John Franks, Scott Krauss, Richard J. Webby, and Robert G. WebsterComments to Author 
Author affiliations: Regional Diagnostic Laboratory on Avian Influenza and Newcastle Disease in Birds, Varna, Bulgaria (A. Marinova-Petkova); National Diagnostic and Research Veterinary Medical Institute, Sofia, Bulgaria (A. Marinova-Petkova, G. Georgiev); and St. Jude Children’s Research Hospital, Memphis, TN, USA (P. Seiler, D. Darnell, J. Franks, S. Krauss. R.J. Webby, R.G. Webster)

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Hemagglutination inhibition titers used to compare the antigenicity of influenza A(H5N1) virus strain A/common buzzard/Bulgaria/38WB/2010 with other common strains*

Strain Strain (clade)
A/common magpie/Hong Kong/
5052/2007 ( A/Muscovy duck/Vietnam/ 1455/2006 (2.3.2) A/duck/Laos/ 3295/2006 (2.3.4) A/Japanese
white-eye/Hong Kong/1038/2006 (2.3.4)
A/common magpie/Hong Kong/5052/2007 160 160 <40 <40
A/duck/Laos/3295/2006 <40 <40 160 80
A/Japanese white-eye/Hong Kong/1038/2006 <40 40 160 320
A/Muscovy duck/Vietnam/1455/2006 80 80 <40 <40
A/common buzzard/Bulgaria/38WB/2010 80 80 <40 <40

*Values represent titers that are the reciprocal of the lowest dilution of ferret antisera that inhibited hemagglutination caused by 4 hemagglutination units of the virus.

Main Article