The events that occur in human body to cause immuno deficiency when HIV gains entry into the body are following:
1.The virus after getting into the body of a person enters the macrophages.
2.The RNA replicates, and DNA is formed by reverse transcription.
3.The macrophages continue to produce virus pasticles.
4.The virus then enters the helper T-lymphocytes replicates and forms progeny virus.
5.The person becomes easily infected by bacteria like Mycobacterium, viruses and even parasites like Toxoplasma.
6.The person is unable to protect himself/herself against any infection.