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| CATEGORIES ABOUT BALTIMORE CLASSIFICATION | |
| viruses | |
| classification systems | |
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Type I: dsDNA viruses ( Herpesviridae , Poxviridae , Adenoviridae and Papovaviridae ) Type II: ssDNA viruses ( Circoviridae and Parvoviridae ) Type III: dsRNA viruses ( Reoviridae and Birnaviridae ) Type IV: positive sense ssRNA viruses ( Astroviridae , Caliciviridae , Coronaviridae , Flaviviridae , Picornaviridae , Arteriviridae and Togaviridae ) Type V: negative sense ssRNA viruses ( Arenaviridae , Orthomyxoviridae , Paramyxoviridae , Bunyaviridae and Rhabdoviridae ) Type VI: diploid ssRNA viruses ( Retroviridae ) Type VII: dsDNA viruses with ssRNA intermediates ( Hepadnaviridae ) It was created by the American biologist David Baltimore and is the preferred way of classifying viruses today. Other classifications are determined by the type of disease the virus causes (localised, disseminated, persistent etc...) or its morphology (spherical, dodecahedral etc...). Neither are particularly satisfactory as very different viruses will sometimes cause the same disease (e.g. Hepatitis ) and viruses with similar structures will often behave very differently (what's more the precise structure of viruses is often difficult to determine under the microscope). Classifying viruses according to their genome means that those in a given category will all behave in much the same way, which offers some indication of how they can be tackled. |
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