Classification of viruses

Classification of Viruses
There are two different types of virus classification.

The two different types of virus classification are as follows:
· The Baltimore’s System for Classification
· The Lwoff’s Scheme for Classification

Baltimore’s System for Classification

In the Baltimore’s System for Classification, there are seven groups of viruses.

The seven groups of viruses are as follows:
· Group I: dsDNA Viruses
· Group II: ssDNA Viruses
· Group III: dsRNA Viruses
· Group IV: (+) sense RNA Viruses
· Group V: (-) sense RNA Viruses
· Group VI: RNA Reverse Transcribing Viruses
· Group VII: DNA Reverse Transcribing Viruses

In group I, families of vertebrate, invertebrate, bacterial, algae, and Mycoplasma viruses are involved respectively.

In group II, families of vertebrate, invertebrate, bacterial, and Spiroplasma viruses are involved respectively.

In group III, families of vertebrate, invertebrate, and protozoa viruses are involved respectively.

In group IV, families of vertebrate, invertebrate, and bacterial viruses are involved respectively.

In group V, the order is Mononegavirales. Families of vertebrate viruses are involved.

In group VI, families of vertebrate viruses are involved.

In group VII, families of vertebrate viruses are involved.



Lwoff’s Scheme for Classification

In the Lwoff’s Scheme for Classification, the families of viruses are grouped according to DNA and RNA.

In terms of DNA, families of viruses are dsDNA and enveloped.

Families of viruses are dsDNA and nonenveloped.
Families of viruses are ssDNA and nonenveloped.
Families of viruses are ds/ssDNA and enveloped.

In terms of RNA, families of viruses are positive dsRNA, nonsegmented and enveloped.

Families of viruses are positive dsRNA, segmented and nonenveloped.
Families of viruses are positive ssRNA, nonsegmented and enveloped.
Families of viruses are positive ssRNA, nonsegmented and nonenveloped.
Families of viruses are positive ssRNA, with DNA step in replication and enveloped.
Families of viruses are negative ssRNA, segmented and enveloped.
Families of viruses are negative ssRNA, nonsegmented and enveloped.
Families of viruses are negative and ambisense ssRNA segmented and enveloped.