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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.
The above answers are quite right. The protein capsid of naked viruses is less susceptible to environmental conditions (lipid solvents, pH, temperature...) than enveloped viruses because the envelop is made in part of phospholipids. Once the envelop is lysed, the virus loses its functional receptors and is not still able to infect susceptible cells. ...