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Viruses consist of a small collection of genetic material (DNA or RNA) encased in a protective protein coat called a capsid. (Retroviruses are among the infectious particles that use RNA as their hereditary material.
Knowledge center. A virus (from the Latin virus meaning toxin or poison) is a microscopic organism consisting of genetic material (RNA or DNA) surrounded by a protein, lipid (fat), or glycoprotein coat.n addition, the body's T cells are sent to destroy the virus. Although most viral infections result in a protective response from the immune system, viruses such as HIV specialize in evading the immune system by using a number of different techniques.