Definition: Virology refers to the study of viruses, which are tiny organisms that can cause illness in living beings. The term "virion" is used as a synonym for the capsid of a virus, or the envelope of a virus. A virus's structure consists of a surface layer with an outer membrane, followed by two layers of double-layered capsids. The capsid contains proteins, RNA and other molecular structures that help the virus to replicate and infect cells. Virology also covers the study of viruses in general, as well as the various ways they can cause illness in humans, animals or plants. This includes understanding how viruses spread from host to host, the effects of infection on the body, and the potential treatments for diseases caused by viruses.
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