Infected (Zombie Crisis 20XX Supplement)
From D&D Wiki
Medium humanoid, neutral evil
Reanimation. If an infected dies, it transforms into a walker 1d4 hours later, unless its brain or body is destroyed.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one grappled creature. Hit: 4 (1d4 + 2) bludgeoning damage, and the creature must make a DC 15 Constitution saving throw or contract the virus.
Unarmed Strike. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage, and the infected can make a grapple attempt against the creature.
Infected are people that have been bitten by zombies but haven't died yet. Mentally, they behave like zombies and are extremely hostile towards uninfected humans. As a side effect of the virus, their mind degrades significantly, and they have trouble speaking coherently or using tools or weapons unless they have a lot of muscle memory with them. Physically, they are still alive, and although they carry the virus it's possible to cure them. They are as fast as uninfected humans, and almost as fragile, if a bit stronger and tougher. Beware, infected rise as walkers after they are killed if they are not disposed of properly.