portrait of edward jenner, english surgeon and country doctor in berkeley who developed the cowpox vaccination as a modern vaccination against smallpox in 1796 - 牛痘 幅插畫檔、美工圖案、卡通及圖標天花病毒, 注射疫苗
vaccinia virus particle (vv), colored transmission electron micrograph (tem) - 牛痘 幅插畫檔、美工圖案、卡通及圖標天花病毒