<prompt> In a 3 year old child, most common cause of hepatitis isPin prickSaliva exchangePerinatalBlood transfusion  <response>: 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. 