Do any other viruses, besides hep B, have the ccc and relaxed circular form

[madhu singh]

Hi
I am new into this field and was wondering if anyone could give me 
information whether any other viruses use the same replication strategy 
as hepatitis B cirus. In other words, do any other viruses use 
covalently closed circular DNA (ccc DNA) as a template for transcription 
and have realxed circular form in the virions???
any input is greatly appreciated
thanks
Madhu

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