Retroviridae
The commonest opportunistic infection in AIDS patient in India is

tuberculosis
cryptococcosis
toxoplasmosis
cryptosporidiosis

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

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

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