Index >> Virus Structure and Classification >> Virus Occurence

Virus Occurence - The occurrence of viruses in the cells of bacteria and higher plant and animals is well established.

Plant viruses
Most plant viruses have been found in angiosperms (flowering plants). Relatively few viruses are known in gymnosperms, ferns, fungi or algae.

Plant viruses are of great economic Importance, since they cause plant diseases in a variety of crops.

Animal viruses
Virus diseases are known in a variety of vertebrates, including fish, amphibia, birds and mammals. Important virus diseases of humans include poliomyelitis, smallpox, rabies, mumps, measles, yellow fever, influenza and encephalitis.