Retroviridae
The commonest opportunistic infection in AIDS patient in India is

cryptosporidiosis
cryptococcosis
tuberculosis
toxoplasmosis

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Retroviridae
HIV or Human Immunodeficiency Virus is considered unique because each virus contains:

a genome made up of both DNA and RNA components
sticky proteins that allow it to bind tightly to host cells
a viral enzyme known as reverse transcriptase
more than 100 copies of the viral genome

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