Nevertheless, in the real world, H5N1 has not yet mutated into a more contagious form, despite having had plenty of chances to mix with human flu viruses.

然而，在现实世界中，虽然H5N1与人类流感病毒发生融合的机会不少，但它没有变异成为接触传染性病毒。

youdao

Though rare, instances of limited human-to-human transmission of H5N1 and other avian influenza viruses have occurred in association with outbreaks in poultry and should not be a cause for alarm.

虽然数量很少，H5N1和其它禽流感病毒在人与人之间的有限传播事例毕竟伴随家禽疫情发生了，但这无须惊慌。

youdao

Users will still want local anti-virus software on their computers for those times when they are not online and to deal with legacy and known viruses.

但是当人们无法上网但需要查杀一些计算机上遗留的已知病毒的时候，用户还是需要使用安装在本地计算机上的杀毒软件。

youdao

University of Illinois Professor May Berenbaum says it appears that bees could deal with one or two viruses at the same time, but not three or four.

VOA: special.2009.09.22

I talked about just not using viruses but using plasmid DNA together with lipids and that's another strategy for gene therapy.

这一部分我们不仅讲了病毒的应用,也讲了利用脂质体包裹的质粒DNA,基因治疗还有其它的策略

耶鲁公开课 - 生物医学工程探索课程节选

We are not seeing the factors that were associated with other H1N1 viruses,".

VOA: standard.2009.05.03

The argument is a development of the one about why Macs are not infested with or attacked by viruses and trojans as often as Windows machines.

FORBES: Apple Won't Let Kaspersky Develop Tools For iOS

Such viruses can be blocked with Sendmail -- but not with Microsoft Exchange.

CNN: Sendmail brings open source technology from Unix to NT

Their reasoning: Mac viruses are infrequent enough that they are not a problem for them to deal with.

FORBES: Imbibing Macs in the Enterprise