For computer virusses it can destroy files,takes long time,hacks the system
for vireus(organism) it can get in our body causing dieseases they can be very contagious and can be spread from on e body to another through food,snneezing touching or body contact.they cannot be prevented by taking antibiotics they cause measels ,flu,cols spores hoped it hels bye
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If you mean by comp. Viruses , then it can destroy our comp. System. It can steal our personal information and can also read our passwords etc. If you mean by viruses present in our atmosphere then it can be harmful for human beings. It causes diseases like influenza, jaundice , AIDS etc.
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