they don’t need anything to survive, they have an overwhelming need to eat even though they don’t need to for survival.
I like the British take on Zombies better. In 28 Days later they were like zombies but they did eventually die.
There was another show where they had treated zombies living more or less normal lives. Funny thing is that they said they had “PDS” for Previously Deceased Syndrom.
I remember someone - can’t remember who exactly - said in the show that they STILL eventually die just that it takes them longer. If, as the theme suggests, this is a WORLDWIDE pandemic, then there are BILLIONS of zombies and potential zombies. Every time a person dies, even of natural causes, they will reanimate as one and then they go on to eat and kill and their victims do and so on. That explains why two years later the group is having to continually fight them. They will only exponentially get worse. Doesn’t look good to me. They will eat EVERY LIVING CREATURE that they can - and it doesn’t have to be human. So even the humans who survive will have to become vegans!