We will need four people.
One person will be chosen at random to slay the infected first. Whoever is host infected will infect the other two, NOT, the one that was chosen to slay. The slayer will knife the three zombies, and the next round a new slayer will be chosen to slay the three infected after following the first procedures, and so on.
This is how we are going to QR boost. My IGN: Sinful-Lies