The Season 1 finale provides clues but no answers.
Ellie is immune to the infection, but why, and how?
She kills the infected, and during the struggle, gives birth to Ellie.
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Anna is bitten during the encounter.
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Marlene (Merle Dandridge) soon arrives on the scene.
Marlene takes Ellie and initially says she can’t bring herself to kill her longtime friend.
But she eventually re-enters the room and quickly shoots and kills Anna.
She then takes Ellie to Boston with her.
But how is Ellie immune?
However, neither the game nor the TV series explain it outright or conclusively.
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