A virus is an acellular particle that infects a host cell. Only in this way is it able to replicate. It is not able to replicate by itself. It can infect prokaryotes (bacteria) and eucaryotes (animals, plants and fungus). It penetrates the host cell and uses what it needs to replicate. It then copies itself. It is 100 times smaller than a cell. All viruses are infective, unlike some bacterias that can also be beneficial. Viruses are known to be associated with various types of cancers.
Different viruses invade different organs. Zapping does not kill your cells so anything hiding in them will not be harmed by the electric current either. Viruses live inside your cells while they reproduce. You can only kill the outsiders: those stuck in your cell gateways. The rest will be killed by your own cells in time. Your body can eliminate any virus in a short time such as hours or days. Viruses can make you sick even though bacteria are the ones that cause pain.