name the causative agent of AIDS. why a person suffering from AIDS cannot fight even minor infections

AIDS is caused by a HIV virus.Human immunodeficiency virus (HIV) is a retrovirus which infects human beings causing AIDS. AIDS is a disease in which the immune system of the individual gets affected and immunity is reduced. Lymphocytes present in the blood are destroyed by HIV. This makes the infected individuals more vulnerable to other fatal diseases and infections. Hence, infected person's body is not able to fight even minor infections like cold and minor infections can be fatal in this disease.  

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hiv virus is its causative agent.....a person is unable to fight minor diseases if he has AIDS as hiv virus attacks the liver and makes the immune system weak.

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