A virus is a small parasite that cannot reproduce by its own. Once it infects a susceptible cell, however, a virus can direct the cell machinery to produce more viruses. Most viruses have either RNA or DNA as their genetic material. The nucleic acid may be single or double-stranded. The entire infectious virus particle, called a virion, consists of the nucleic acid and an outer shell of protein. The simplest viruses contain only enough RNA or DNA to encode four proteins. The most complex can encode 100 - 200 proteins. Since many viruses can infect a large number of different cell types, genetically modified viruses often are used to carry foreign DNA into a cell. This approach provides the basis for a growing list of experimental gene therapy treatments.

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Citation

Citation: Ehsan Kamani and Zahra Kamani. “The Effect of Low-Level Laser on Increasing Platelet and T Lymphocyte Immune Systems in Patients with (COVID-19)" Acta Scientific Clinical Case Reports 1.10 (2020): 01-02.

Copyright

Copyright: © 2020 Ehsan Kamani and Zahra Kamani. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.