In a 3 year old child, most common cause of hepatitis is –: (A) Pin prick, (B) Saliva exchange, (C) Perinatal, (D) Blood transfusion
Answer is D. "Children usually acquire infection indirectly, through parenteral route from hepatitis B contaminated blood tran.sfilsion".
Other modes of transmission in children : -

Sharing of contaminated hypodermic needles used for multiple doses of infection.
Shaving razors.    •
Sexual contact Adolescent boy & girls.