<unk>  involves naming and placing<unk> es into a taxonomic system. Like the relatively 
consistent classification systems seen for cellular organisms,<unk>  is the subject of ongoing debate and proposals. This is largely due to the pseudo-living nature of<unk> es, which are not yet definitively living or non-living. As such, they do not fit neatly into the established biological classification system in place for cellular organisms, such as plants and animals, for several reasons.<unk>  is based mainly on phenotypic characteristics, including morphology, nucleic acid type, mode of replication, host organisms, and the type of disease they cause. A combination of two main schemes is currently in widespread use for the classification of<unk> es. David Baltimore, a Nobel Prize-winning biologist, devised the Baltimore classification system, which places<unk> es into one of seven groups. These groups are designated by Roman numerals and separate<unk> es based on their mode of replication, and genome type. Accompanying this broad method of classification are specific naming conventions and further classification guidelines set out by the International Committee on Taxonomy of<unk> es.
Virus classification
Influenza classification
Microbiology template
Diagnostic test
Tuberculosis classification
Cell culture
DNA extraction
Swine influenza classification