一旦病毒从动物身上“溢出”到从事相关职业的人身上譬如狩猎，农耕或活禽市场买卖，在相关人员被传染后，病毒开始发威。
These outbreaks will flare up after viruses "spill over" from animals into people with occupations such as hunting, farming or working in live-animal markets.
H3N2病毒一开始是从人身上传染到猪的，现在的H3N2猪流感病毒与H3N2人流感病毒有着很近的相关性。
The current swine flu H3N2 viruses are closely related to human H3N2 viruses.
这种病毒很容易从一个人传染到其他人身上。
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