In Jonathan Maberry's Patient Zero, the zombification disease functions by making the host enter a deep hibernative state when they are close to dying, then waking them up again after shutting down parts of the body that are severely damaged or not necessary for the zombie's survival. The zombies have super-regenerative abilities which helps them seal up wounds almost instantly and it is stated that they can only be killed by damage to the brain.
However the book also says that zombies still breathe and their hearts are still pumping blood, albeit at a minimum rate, so shouldn't the zombies be vulnerable to body shots too?
