What is the point of a virus?
Our lives have been turned upside down by a virus, an object so tiny it is invisible to the naked eye. I say object, because although some commentators have referred to Covid 19, a Coronavirus, as “living” on different surfaces for various lengths of time, a virus is not really alive in the usual sense – it is a parasite that cannot exist long outside its host cell nor reproduce on its own. Scientists still debate whether the many viruses should be included in the “tree of life” for they do contain DNA and/ or RNA which are the building plans for all life and the chances are that they have accompanied us closely on our evolutionary journey. But if they are not really alive and their only capability is replication – in the process, damaging or even killing their hosts – what is the point of them?
Darwin, who gave us the Theory of Evolution, was originally training to be a clergyman but far from debunking the ideas that geology was spreading about the Earth being millions of years older than the Bible indicated, Darwin disappointed the devout Robert FitzRoy, Captain of HMS Beagle by postulating the theory which would explain the progression of life to be found in the rocks. After the voyage of the Beagle, Darwin settled down to marriage, family and working on his theory, holding back from publishing his work until the last minute, when others threatened to get there first, out of a touching desire not to upset his friend FitzRoy’s religious sensibilities. But during this period, Darwin’s beloved daughter – Annie, died of Scarlet Fever (a bacterial rather than viral) and Darwin’s own belief in God took a terrible knock. The final nail in the coffin for Darwin’s beliefs was his learning of species of parasitical wasps that lay their eggs inside a living caterpillar so that when the eggs hatch, the wasp young feed and grow – eating their host from within. For Darwin, the idea that God could create such cruelty not to mention take the innocent life of his daughter, was too much to bear.
So Darwin would have been fascinated but appalled had he been around to see how the development of our understanding of the parallel evolution of viruses and animals, reveals something so pointless and so potentially devastating for the animal kingdom. We sit transfixed by daily news broadcasts announcing death tolls reaching and exceeding thousands in different countries but this is nothing compared to the Spanish Flu pandemic of 1918. We think that 50 million people died worldwide but it could have been up to 100 million – our means of recording the deaths in that pre-global village world was simply not adequate enough to know. Given the ease of the spreading of the virus by modern transport and mass travel, we might think that we are doing very well to have contained the pandemic as well as we have, government failure to act notwithstanding…
So what is the point of virus? Well there simply is no point, they just are because they are. They hone our immune systems but if they didn’t exist we wouldn’t need such defenses. They are not living organisms such as bacteria (though we could do without some of those little critters too). If you believe in God, you would have to ask yourself why he would create such a thing. If you don’t believe in God then and you accept evolution as the roller-coaster ride that has brought species and their attendant parasites, including viruses, to the place we are today, then, ironically, something which is arguably “life”, is a metaphor for life itself. Life appears to have been, likely, accidental though probably inevitable given the inconceivable multitude of planets that exist in the universe. Life, apparently, exists for no purpose other than to exist and reproduce and as the mathematician Augustus De Morgan, said in his short rhyme “Siphonaptera”, from his book A Budget of Paradoxes (1872), (Siphonaptera being the biological order to which fleas belong)
Great fleas have little fleas upon their backs to bite ’em,
And little fleas have lesser fleas, and so ad infinitum.
And the great fleas themselves, in turn, have greater fleas to go on;
While these again have greater still, and greater still, and so on.
(Wikipedia)
If that analysis seems a little negative, stay with me, it’s not the whole story…
Now to the technical stuff:-
If you want to understand what a virus is, there is a good article here. This excellent article explains the body’s defence mechanisms – in particular B-cells and T-cells. A very technical article explains the body’s immune system over-reaction called the Cytokine Storm which is mostly the cause of death with Covid 19.