Sent_en: 2zh This novel variant may have become dominant ... because it was not as easily affected as other strains by the avian vaccine used to prevent H5 infection.
Sent_yy: “这种新型变种可能已成为主导……因为它不像其他菌株那样容易受到用于预防H5感染的禽流感疫苗的影响。”