Avast antivirus for linux

[Joseph]

Ioannis Vranos wrote:
> Matthias Andersson wrote:
>> Hi!
>>
>> Would it be possible to add Avast antivirus for linux into the Ubuntu
>> repositories? The software is free for download - the only licensing
>> issue is that the users will then have to get a license key from the
>> avast homepage (this also free of charge).
>>
>> Cheers,
>> Matthias Andersson
> 
> 
> f-prot for linux is even better, it is free, it doesn't require a key
> and also there is xfprot.
> 


Something bothers me with this....

I'm told that Linus is, a far as we know, impervious to virus'....   so why is there an anti-virus for an OS which doesn't 
get sick?