Over the years, different variations of swine flu viruses have emerged. At this time, there are four main influenza type A virus subtypes that have been isolated in pigs: H1N1, H1N2, H3N2, and H3N1.
随着时间的推移，也出现了猪流感病毒的多种变种：现在人们从猪身上分离出了4种主要的A型流感病毒亚型：H1N1，H1N2，H3N2，H3N1。
Over the years, different variations of swine flu viruses have emerged. At this time, there are four main influenza type A virus subtypes that have been isolated in pigs: H1N1, H1N2, H3N2, and H3N1.
随着时间的推移，也出现了猪流感病毒的多种变种：现在人们从猪身上分离出了4种主要的A型流感病毒亚型：H1N1，H1N2，H3N2，H3N1。
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