Least common mode of transmission of HIV-: (A) Homosexual contact, (B) Heterosexual, (C) IV drug abuse, (D) Transfusion of blood products
Answer is D. Homosexual or Heterosexual contact  → 50-70%
IV drug abuse  → 25%
Recipient of blood and blood components → 1%
Haemophiliacs receiving factor VIII or IX  → 0.5%