Sick Teenager (TV Series)

The sick teenager is a survivor featured in Season 4 of AMC's The Walking Dead.

Location Unknown
Nothing is known about this boy's life before or as the outbreak started, but it is presumed that he was a student who lived with his parents.

Post-Apocalypse
The teenager survived out in the wilderness before being rescued and brought to the prison.

"Infected"
The boy flees Cell Block D with another woman as other survivors are attacked by zombified residents.

"Isolation"
The teenager is seen walking outside, sick and coughing up blood, as two women follow him. Tyreese stares at the boy for a moment before he walks past him.

"Internment"
When the bearded man collapses on the floor and dies, several of the sick prison survivors come out of their cell and look at the body, with Hershel kneeling over the dead man. Hershel sees everyone watching the situation, and he tells them all to return to their cells so he may take care of the body. The boy watches Lizzie lead Henry away from an unconscious Glenn. When Daryl and the others return to the prison, the sick survivors are given medicine.

"Too Far Gone"
While he was seen running down stairs very briefly, he managed to escape with other survivors on the bus.

Trivia

 * Originally, there was talk of several more background survivors (other than Chloe, Greg, Henry, and Mr. Jacobson) receiving names, but this was scrapped as these survivors were never established. Instead, many were given nicknames, such as the Sick Teenager and the Achey Woman.
 * In an interview with Will Martin, he revealed that there is a deleted scene from "Internment" where they showed him brushing his teeth and then spitting up blood and toothpaste into a tin cup as Hershel wheeled Mr. Jacobson out of the cell block.