对低致病性的所有H5和H7毒株和其他病毒，在缺乏胰蛋白酶的细胞上能够生长时，则应进行与血凝素有关肽链的氨基酸序列分析，如果分析结果同其他高致病性禽流感病毒相似，这种被检验的分离物应被考虑为高致病性禽流感病毒。近期国外有发生一起H5型禽流感疫情。

据悉，加拿大食物检修署（CFIA）确认安大略省南部一火鸡养殖场发生H5型禽流感疫情，加拿大CFIA已对农场及周边农场隔离检疫防止疾病传播，且已通知有关部分采取措施强化生物安全。加拿大食物检修署正在进行进一步的测试以判断病毒株致病性以及精确亚型。快捷康生物生产的H5亚型禽流感抗原检测卡以双抗体夹心法为基础，采用免疫层析金标记技术，快速检测禽流感H5病毒。

目前加拿大CFIA已按照有关条例对感染的鸡进行处理。安大略省、CFIA与养殖业主正合作控制疫情蔓延。

H5亚型高致病性禽流感常常给养禽业造成巨大的经济损失,严重威胁世界各地的养禽业。加强防控措施亟不可待。

部门原文报道如下：

Preliminary testing by the Province of Ontario has confirmed the presence of H5 avian influenza on a turkey farm near Woodstock, Ontario.

The Canadian Food Inspection Agency （CFIA） has placed the farm, and a neighbouring farm, under quarantine to control disease spread and the industry sector has been notified to adopt enhanced biosecurity practices.   Further testing by the CFIA is underway to confirm pathogenicity and to determine the precise subtype and strain of the virus. Pathogenicity refers to the severity of the illness caused in birds. Results are expected within days.