最近几天，对H1N 1流感病毒的基因测序分析表明，这种病毒的毒性不像之前所认为的那样致命。
In recent days, genetic sequencing analyses of this flu have suggested it is not as virulent as suspected.
它们不是毒理学研究。毒理学研究涉及分析动物组织研究毒性作用，或其他安全方面的研究，如横向基因转移率。
They are not toxicological studies, which would involve analysing the animal tissue for toxic effects, or studies of other safety aspects such as the rate of horizontal gene transfer.
毒性基因结构分析表明，V2、V2+6和V8等毒性基因的频率有较大变化。
The results of virulence gene survey showed that the frequencies of V2, V2+ 6 and V8changed widely.
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