In Season 1 Episode 6 “Pinkeye”, Pip becomes a zombie. Cartman calls Pip “A little limey zombie”, making this episode the first time he calls Pip British instead of French (Limey being a term used to refer to British people).
Pinkeye: Symptoms And Treatments — Life and Health
Pink eye is most often caused by a viral infection or a bacterial infection. Although pinkeye can be irritating, it rarely affects your vision.
Pinkeye: Symptoms And Treatments — Life and Health