Viruses with ds DNA genome
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Family: Adenoviridae
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Non enveloped, icosahedral with fibre protein at each vertex, ds stranded linear DNA, replication in nucleus
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Family: Asfarviridae
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Enveloped,200 nm icosahedral particle with 70 nm isometric core, linear ds DNA, cytoplasmic replication.
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African swine fever virus
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Family: Herpesviridae
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Enveloped 200 nm particle with spikes,enclosing a tegument and an icosahedral nucleocapsid of 100 nm. Linear ds DNA, replication in nucleus. Large family, latency common, some are oncogenic.
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Three subfamilies – alphaherpesvirinae, betaherpesvirinae and gammaherpesvirinae.
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Family: Papilomaviridae
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Non enveloped, 55 nm icosahedral, covalently closed circular ds DNA genome, replication in nucleus, some are oncogenic.
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Family: Polyomaviridae
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Nonenveloped, 40-45 nm icosahedral, covalently closed circular ds DNA , replication in nuceus oncogenic.
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Simian virus 40 (SV 40)
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Family: Poxviridae
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Brick shaped or ovoid virions of 220-450 nm x 140-260 nm wide, some enveloped. Complex structure enclosing two lateral bodies and a biconcave core. Linear ds DNA genome, cytoplasmic replication.
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Two subfamilies – Chordopoxvirinae (viruses of vertebrates) and Entomopoxvirinae (viruses of insects).
Viruses with ss DNA genomes
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Family: Circoviridae
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Nonenveloped small icosahedral, circular ss DNA genome
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Porcine circovirus 1 and chicken anaemia virus
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Family: Parvoviridae
Viruses with DNA genome that replicate through RNA intermediate
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Family: Hepadnaviride
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42-50 nm enveloped particle with projections, isometric nucleocapsid with DNA polymerase and protein kinase activities, partially ds DNA that is not covalently closed. Complete negative sense strand of 3000 nt and a variable length positive sense strand of 1700 – 2800 nt, contains reverse transcriptase.
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Hepatitis B virus of humans, duck hepatitis B virus
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