There are lots of virus's out there Trojans are normally the worse
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Humans and human activity are the biggest threat to humans.
The YEAST cell is by far the biggest cell out of a BACTERIUM and a VIRUS.... I know this 'cos it was on my science homework and 'cos i found it on another website which gave me the urge to put it here since the question hadn't been answered....x
its a very bad virus. bad virus is no category . It is retro virus
virus
AIDS is not a virus. However, HIV is a RNA virus.