In which year did scientists discover the virus that causes AIDS?

In which year did scientists discover the virus that causes AIDS?

سائنسدانوں نے ایڈز کا سبب بننے والا وائرس کس سال دریافت کیا؟
Explanation

Aids way to spread is Touch

AIDS stands for Acquired Immunodeficiency Syndrome.

HIV stands for Human Immunodeficiency Virus.

HIV attacks the immune system of the body 

AIDS virus has single-stranded RNA

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