In February 2004 a highly pathogenic avian influenza outbreak erupted in the Fraser Valley of British Columbia, Canada. The index farm was a chicken broiler breeder operation comprising two flocks, 24 and 52 wk of age. Birds in the older flock presented with a mild drop in egg production and a small increase in mortality. Pathological specimens taken from the older flock were submitted to the provincial veterinary diagnostic laboratory from which an influenza A virus was isolated. While still under investigation by the provincial veterinary authorities, a spike in mortality was observed in birds belonging to the younger flock. Diagnostic material from both flocks was forwarded to the Canadian Food Inspection Agency's National Centre for Foreign Animal Disease. A low-pathogenicity H7N3 virus was detected in the older flock and a novel highly pathogenic H7N3 virus was found in specimens collected from the younger flock. Despite destruction and disposal of birds on the index farm, the virus spread to adjacent farms. Given the high density of poultry operations in the Fraser Valley and the high level of integration amongst industry support services, a total of approximately 17 million chickens, turkeys, ducks, geese, and speciality birds were put at immediate risk. Despite movement controls the virus spread and established itself in three distinct clusters. To prevent further spread, healthy, marketable birds outside of the surveillance areas were pre-emptively slaughtered. Although highly pathogenic avian influenza is a federal responsibility, the successful control and eradication of this outbreak would not have been possible without the cooperative involvement of federal and provincial diagnostic laboratories. The success of this collaboration was partly responsible for the formation of a national avian influenza laboratory network.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 51 • No. s1