20 years of viruses

20 years ago if someone were to say they had a virus, they meant that they had an ultramicroscopic infectious agent that replicates itself only within cells of living hosts crawling inside their body. But now we have to think twice when we here that word. The two meanings of the same word have a lot in common, they are both a nuisance, but you don't hear about too many people purposely trying to spread a biological virus.