What are the various routes by which transmission of human immunodeficiency virus takes place ?

Explanation

(i) Unprotected (without condom) sexual intercourse with an infected partner.
(ii) Use of contaminated needles and syringes.
(iii) Use of contaminated razors for shaving.
(iv) Transfusion of infected blood or blood plasma.
(v) Organ transplantation from an infected person.
(vi) From infected mother to the baby at the time of child birth.