Criteria for Viral Classification 16
Families of DNA Viruses 17
Families of RNA Viruses 22
Other Viruses 27
Groupings Based on Epidemiologic/Pathogemc Criteria 28
There is good evidence to indicate that ail organisms are infectable by viruses: vertebrate and invertebrate animals, plants, algae, fungi, protozoa, and bacteria; indeed, every species of animal, bacterium, and plant that has been intensively searched has yielded numerous different viruses belonging to several viral families. Because all viruses, whatever their hosts, share the features described in the previous chapter, viral taxonomists have developed a scheme of classification and nomenclature that is universal. In this book, however, we are concerned solely with the viruses that cause disease in humans. Some of these (called arboviruses) also replicate in insects, ticks, or other arthropods
Several hundred distinguishable viruses have been recovered from humans, the best studied vertebrate host, and new ones are being discovered each year Somewhat fewer have been recovered from each of the common species of farm and companion animals and from the commonly used laboratory animals. To simplify the study of this vast number of viruses we need to sort (hem into groups that share certain common properties.
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