is it used in any therapy?
Yes, Virotherapy.
Virus
Virotherapy involves the use of genetically modified viruses to treat diseases. 
the four chemical bases that make up dna are adenine thymine guanine and cystosine Yes, that is correct. what is the full form of the abbreviation mentioned above? Deoxyribonucleic acid. what is it? It is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. can you explain a bit more about the microorganism that you just mentioned? A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. from where does it get its name? Latin. by whom was it discovered? Bartholomeus Anglicus. what living features does it show? They possess genes, evolve by natural selection, and reproduce by creating multiple copies of themselves through self-assembly. how is it classified? By phylum, class, order, family, genus, and species. has it been weaponized? Yes.
wiki:11135529
Virus [SEP] Virotherapy
Virotherapy involves the use of genetically modified viruses to treat diseases. Viruses have been modified by scientists to reproduce in cancer cells and destroy them but not infect healthy cells. Talimogene laherparepvec (T-VEC), for example, is a modified herpes simplex virus that has had a gene, which is required for viruses to replicate in healthy cells, deleted and replaced with a human gene (GM-CSF) that stimulates immunity. When this virus infects cancer cells, it destroys them and in doing so the presence the GM-CSF gene attracts dendritic cells from the surrounding tissues of the body. The dendritic cells process the dead cancer cells and present components of them to other cells of the immune system.