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There is an internationally agreed scheme within which viron characteristics can be assigned as these constitute five main hierarchical levels; order, family, subfamily, genus and species. Virus orders all have the suffix ''-virales'' and virus families have the suffix ''-viridae'' whilst a sub-family is denoted by ''-virinae''.Virus genera are denoted by the suffix ''-virus''. Only two of the orders discovered so far contain viruses that are able to infect animals. The first is ''Mononegavirales'' which contains the families ''Paramyxoviridae'', ''Rhabdoviridae'', ''Bornaviridae'' and ''Filoviridae''. The second order is ''Nirovirales'' which comprises  ''Coronaviridae'' and ''Arteriviridae''.

There is an internationally agreed scheme within which viron characteristics can be assigned as these constitute five main hierarchical levels; order, family, subfamily, genus and species. Virus orders all have the suffix ''-virales'' and virus families have the suffix ''-viridae'' whilst a sub-family is denoted by ''-virinae''.Virus genera are denoted by the suffix ''-virus''. Only two of the orders discovered so far contain viruses that are able to infect animals. The first is ''Mononegavirales'' which contains the families ''Paramyxoviridae'', ''Rhabdoviridae'', ''Bornaviridae'' and ''Filoviridae''. The second order is ''Nidovirales'' which comprises  ''Coronaviridae'' and ''Arteriviridae''.

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