在这种疫苗中,病毒被削弱了,但它们还活着。
In this vaccine, the viruses are weakened, but they are alive.
经验还显示,病毒在禽鸟中不断流行,就有发生零星人间病例的持续危险。
This experience has also shown that continuing circulation of the virus in birds carries a continuing risk of sporadic human cases.
H1N1新病毒迅速挤出其它传播中的流感病毒,看来还取代了早前的H1N1病毒。
The new H1N1 virus rapidly crowded out other circulating influenza viruses and appears to have displaced the older H1N1 virus.
They, in some cases, they integrate their DNA into the host chromosome, that's what retroviruses do and they make viral proteins.
有些情况下,病毒DNA会整合进宿主的染色体中,逆转录病毒就是这样做的,它们还制造病毒蛋白
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