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Viruses are microscopic and infectious microorganisms that are made up of genetic material enclosed in a protein coating. They cause a variety of serious infectious diseases including influenza, hepatitis, common cold, rabies, AIDS, smallpox, dengue fever and measles. Viruses are classified into four types based on the host cell that they infect, and these include plant viruses, bacteriophages, animal viruses and fungal viruses. Virology is th...

Viruses are submicroscopic, subcellular agents that cannot replicate outside of a host cell. They can infect all living things, including birds, bacteria, reptiles, mammals, protozoa, insects, plants, fungi, and fish. Virology refers to the scientific study of the biology of viruses and viral diseases, comprising their evolution, physiology, biochemistry, clinical aspects, molecular biology, distribution, and ecology. Due to their small size, ...