Why Is Everyone Getting Sick in the Walking Dead?
When Informed by Rick of the Death of Violet the Pig and a Sick Boar Discovered in the Woods, Hershel (Scott Wilson) Notes That, Pre-Apocalypse, Some Diseases...
When informed by Rick of the death of Violet the pig and a sick boar discovered in the woods, Hershel (Scott Wilson) notes that, pre-apocalypse, some diseases were spread by pigs and birds. They conclude that everyone in the cell block could be infected by an aggressive strain of the flu.
What was the sickness in Season 4 of The Walking Dead?
In 2009 (just around when season 4 was being written) there were a lot of media panic about Swine Flu. As Wiki states: Some patients experience severe respiratory symptoms.
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Why is Rosita sick?
She was contaminating the water supply. Recall, she sliced open a zombie, bled it into the creek, pulled out its guts, and pushed it out in the water. Water contaminated by zombie blood does not necessarily kill its victims, but it can make them very sick.