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Phage therapy, viral phage therapy, or phagotherapy is the therapeutic use of bacteriophages for the treatment of pathogenic bacterial infections. [ 1 ] [ 2 ] [ 3 ] This therapeutic approach emerged at the beginning of the 20th century but was progressively replaced by the use of antibiotics in most parts of the world after the Second World War .
(A) When the host cell is only infected by a giant virus, the latter establishes a cytoplasmic virus factory to replicate and generates new virions, and the host cell is most likely lysed at the end of its replication cycle. (B) When the host cell is co-infected with a giant virus and its virophage, the latter parasitizes the giant virus factory.
Virotherapy is a treatment using biotechnology to convert viruses into therapeutic agents by reprogramming viruses to treat diseases. There are three main branches of virotherapy: anti-cancer oncolytic viruses, viral vectors for gene therapy and viral immunotherapy.
In the lytic cycle, the virus commandeers the cell's reproductive machinery. The cell may fill with new viruses until it lyses or bursts, or it may release the new viruses one at a time in an exocytotic process. The period from infection to lysis is termed the latent period. A virus following a lytic cycle is called a virulent virus.
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Phaeocystis globosa virus virophage, or PgVV, or Preplasmiviricota sp. Gezel-14T, [1] is a polinton-like virus, which are small DNA viruses that are found integrated in protist genomes. Similar to virophages , PgVV requires a helper virus to replicate .
Sputnik was first isolated in 2008 from a sample obtained from humans; it was harvested from the contact lens fluid of an individual with keratitis. [4] Naturally however, the Sputnik virophage has been found to multiply inside species of the opportunistically pathogenic protozoan Acanthamoeba, but only if that amoeba is infected with the large mamavirus.
Dr. A. Thomas McLellan, the co-founder of the Treatment Research Institute, echoed that point. “Here’s the problem,” he said. Treatment methods were determined “before anybody really understood the science of addiction. We started off with the wrong model.” For families, the result can be frustrating and an expensive failure.