Bacteria are free-living cells that can live inside or outside a human body, while viruses are a non-living collection of molecules that need a host, i.e. any living cell to survive. There are 1000’s of viruses.
It seems that the covid disease is caused by one type of virus (the covid virus of which there are different ones) and not by bacteria. Experts still argue of the origin of the covid virus(es) since early 2020, e.g. man made or from other animals, etc. I have been tested and my body cells are full of viruses of all sorts but not the covid virus.