Task: Translation
Input (Chinese): 易观和他的研究小组观察的禽类中，至少95%感染了这种新型病毒，而为对抗H5N1病毒而研制的疫苗也没有发挥作用。
Output (English): At least 95% of the birds Guan and his team looked at were infected with the new strain and vaccines formulated to fight the H5N1 virus have not worked.