system
Given the following post, respond as if you're commenting on Reddit:
human
[World War Z Film] The implications of the Zombies' special ability (spoiler)

So, the WWZ film zombies can instantly tell whether you have a deadly illness or not. Apparently, this is *any* illness, ranging from cancer, to a viral infection, to a bacterial one. 

What are the implications of this miraculous discovery? How does modern medicine change after Z-day? Does this mean that every oncologist have a chained-up zombie in their office?
gpt
Define illness though. Like sure it might detect cancer but what about a mild cold or a stomach bug or auto-immune disease or tapeworms or whatever. 

Its not like the zombie will be like *growl snarl snarl snarl growl drool* and the doctors will go "oh, he has some T-Cell abnormalities, we should do a blood test". 

So many humans have so many things wrong with them, a zombie that detects any and all is useless. One that detects specific kinds of illness i.e. cancer is actually useful but again how will it work since there are also benign growths that dont do anything and many people have them with no changes to their health. 

Its useless if it detects any illness since most people have something wrong with their bodies all day every day, we just dont notice it.