Guess there is another "completely normal" individual to be met in the near future.
Wonder if Miya will become a sentient dead, she did just die on her own, though who knows, she might've expired out of simple malnutrition and it's a case of "we are all infected". Well the flashbacks do show people dying of "an infection" so guess the zombie virus can kill you on its own. Hmm, maybe that is the key factor, those who "die" of the virus regain their sentience, but anyone who gets infected by the sentients becomes a regular zombo?