Virology is the study of
viruses – submicroscopic, parasitic particles of genetic material contained in a protein coat – and virus-like agents. It focuses on the following aspects of viruses: their structure, classification and evolution, their ways to infect and exploit host
cells for reproduction, their interaction with host organism physiology and immunity, the diseases they cause, the techniques to isolate and culture them, and their use in research and therapy.
Virology is a subfield of microbiology. A major branch of
virology is
virus classification.
Viruses can be classified according to the host cell they infect: animal viruses, plant viruses,
fungal viruses, and bacteriophages (viruses infecting bacterium, which include the most complex viruses). Another classification uses the geometrical shape of their capsid (often a helix or an icosahedron) or the virus's structure (e.g. presence or absence of a lipid envelope).
Viruses range in size from about 30 nm to about 450 nm, which means that most of them cannot be seen with light microscopes. The shape and structure of
viruses has been studied by electron microscopy, NMR spectroscopy, and X-ray crystallography.
Relevant Topics in Medical Sciences
