人患猪流感human cases of Swine Flu
猪流感病毒 the H1N1 swine flu viruses H1N1
抗原变体antigenic variant
抗原变异 antigenic variation
抗原飘移 antigenic drift
抗原位移 antigenic shift
从病毒中获取遗传物质 scrambling/acquiring genetic materials from human and avian viruses
“混合器” “mixing vessel”
流感的亚型 influenza subtype
自然免疫力 natural immunity