the zombies proubly have different ways to find out whos infeccted. they might eat each other when fresh meats unavaalible. or mabye the cells in there brain tell them to see in thermal and kill everything that emits more heat then them like the waay a zzombie ant climbs up the hihest point. the infecction MAKES them. then they die and a big ass spore grows out there head then explode.
Since it is a virus it needs a host in which to incubate and an active blood supply to replicate and take over the brain. I think that when it mutates the brain it imprints an instinct to attack only those that aren't already infected.
Looking at the horse hair worm, a parasite that actually emits chemicals from inside an insect host to kill it while it vows indie, I believe that the infection would release the chemicals into the Brian, givin it authority on what and what not to eat. But you would need a Brian that is at least partially intact for this, which is why you don't see many month old zombies in pop culture.
Backing away from this, how would the zombies in "Night of the Living Dead" function? The reason they were reanimated was because of imense radiation from Venus. That makes no sense. Then again, this was made in '68, when no one thought of zombies like we do today.
Zombies feed on the living flesh not out of hunger but out of instinct( this is explained in the 1985 film, Day of the Dead). This shows that the zombies act upon the most primitive part of the brain. Maybe the instict in the brain that steers them away from food that might be harmfull or damaging from consumption is still active. The instinct to eat safe, non-contaminated food along with he instict to eat drives the zombies to only eat the flesh of living humans.
Thats my opinion. The thought of the virus giving off an oder or a hormone is also valid. There is a medical case where a man suffered from head trauma and afterwards his sense of smell was hightend far beyond normal human capabilities. The virus may effect the brain to cause a similar effect.
Taking these factors into consideation, both seem as possible as the other.
If the virus came from the conspiracy theory labs of governments experiment of Alien DNA which could create a new formula that triggering the Z's spreading or waking up the dead from the grave. The Zombies would have their telepathy ability to communicate with each other and recognizing their own kind. I really hope they can't read our minds (also) - it's gonna be very very terrible things ever happens...
Simple. We all pick up on it every day, whether we realize it or not. Humans release pheremones to attract 'mates' if you will. When we die (This theory applies to dead zombies only, not infection zombies) the pheremones stop working. In theory, if the zombies can still sense the pheremones, they can sense the human. As humans, we cannot pick up on other animal's pheremones, which would explain why zombies are rarely seen attacking wild animals, as they would have to rely on sight and sound to do so. Have you noticed that when a human is hiding from a zombie, the zombie will often sniff the air and then knows where the human is? The pheremone recepter is located about 2-3 inches inside the nose, which would explain this. Infection zombies are a completely different story. The parasite takes over the brain of so-called zombie. The one thing that an infection or virus will always try to do is grow and multiply. To do this, it would need other hosts (people.) The virus would drive the infected person to infect as many people as possible, and it would be completely unneccecary to infect a host who is already infected. Hope this helps!
cause they're smart, kinda primitive organism which developed through times and they've survive...
in a form of bacteria or virus that loosen after a fatal scientific experiment or through forest exploitations/mines area devastation !
What if they can smell live tissue, and they eat brains to spread the infection? I think a zombie is made when the outer part of our brain is gone, because we could still do basic things with core, but the outer part gives us feelings.