Minecraft wiki entry for Legacy_village_mechanics, associated text: There are two ways to cure an infected zombie villager. The first method requires you to travel to the nether and collect at least two blaze rods, to craft a brewing stand, and then to turn the blaze rods into blaze powder to operate the brewing stand (as of 1.9). Then you need to brew a splash potion of weakness, and craft a golden apple (the "ordinary" one, that takes ingots to craft). When you find a zombie villager, toss the potion of weakness at it, and then right-click it with the golden apple. The zombie begins shaking for up to 5 minutes, then it turns into a villager of the corresponding profession and a random career.