4.2 Infected

With the impact of the flu epidemic, the council issue a quarantine. To make matters worse, someone has lured Walkers to a specific point in the fence. Rick and the gang fight off the Walkers before the fence gives in.

Plot Summary
Carl asks for his gun back while he and his dad are in the garden,but Rick dodges the question. Suddenly, Glenn sounds the alarm to a walker attack in the prison. Patrick, who had died the night before had infected several other survivors. The walkers attack many of the survivors before they are taken down. Fearful that the illness might spread, they isolate Sasha and those like her who have the illness. A council meeting is called the leaders discover that the first walker in the prison had died from an illness. Fearful that the illness might spread, they isolate Karen and those like her who have the illness. Maggie screams for help at a fence as a pile of walkers begin pushing down the fence.

The group tries to push the walkers back, but it is an insurmountable task. As they push, Sasha finds rat carcasses, indicating that someone had lured the walkers there. Rick get an idea and comes back with a truck. Together with Daryl, they lead the walkers away by dropping a trail of pigs away from the prison. Afterward, Carl sees Rick burning the pig pen. He tells Rick that Carol has been teaching the children to use knives. Rick decides to allow Carol to continue teaching and he hands Carl his gun and holsters his own gun, knowing he can trust his son again. In the prison, Tyreese finds a trail of blood leading out Karen's room. He is then shocked to find Karen and another person's burnt corpse outside.