microscopic view of h5n1 virus with red blood cells and white blood cells. - 糖蛋白 幅插畫檔、美工圖案、卡通及圖標病毒, 瘟疫
conceptual image of hiv virus. hiv is the human immunodeficiency virus that can lead to acquired immune deficiency syndrome, or aids. - 糖蛋白 幅插畫檔、美工圖案、卡通及圖標