The Walking Dead: Exact Moment Each Person Became Infected

The power of Sophia's (Madison Lintz) death is that we never actually see her get bitten. Separated from the group after a walker attack, the group stay at the Greene farm whilst hoping to find her.

She is later revealed to have been bitten and turned after splitting off from the others, much to the horror of her mother and the rest of the group. As she famously emerges from the Greene barn, Rick puts her down.