The high pathogenicity avian flu has broken out in many countries this spring.
今春，不少国家和地区都相继爆发了高致病性禽流感。
But they had high fatality the and pathogenicity to mice in animal experiment.
动物实验表明这些菌株对小鼠有较强的致病力和致死率。
But they had high fatality the and pathogenicity to mice in animal experiment.
动物实验表明这些菌株对小鼠有较强的致病力和致死率。
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