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This is actually a good topic to discuss. Part of my personal zombie fantasy is the whole problem of how it starts. Especially when we see main characters taking out zoms with simple melee weapons like hammers and knives. It begs the question, if they can be taken down that easily, how is ANYONE actually turned? I think one method that a lot of zom fiction tries to explore is an alternate history, where zombie culture does not exist yet, and people don't actually know what they are dealing with. People are always like "people... dead people... are coming back alive! OMGOMGOMG!" Like it is something never before conceived, "frank this isn't you, snap out of it, snap out of it, AAAH why are you biting me?" In reality, the entirety of the public has experienced zombie fiction, so within a short amount of time, they would recognize "this is a zombie, it's not a person anymore, we shoot them in the head, this is how they move, this is how to avoid them, ect." People would be like "Hey bob?" "yeah?" "there's zombies." "shoot them in the head?" "yup, just like that."
The only way I could see an apocalyptic zombie scenario actually starting would be if somehow a large fraction of the population got turned simultaneously WITHOUT getting bit, or having to experience transmission the normal way we think about it. The way I conceive this as a possibility is if the virus gets taken down easily by normally functioning immune systems, but can take over a person who's immune system is compromised. This means people who are currently very sick with a certain virus, people who are suffering from AIDS, children and the elderly, and maybe people in colder environments. All these demographics would get a few traces of the virus just from the air, but normal, fully grown, healthy individuals would be able to fend it off.