Zombie Basic

All Biological Zombie start the same way, more or less. If you get bitten and survive long enough, you'll become a Zombie.

Disease

Walker, Crawler

If they are wearing anything, it will likely be torn in a few places.

Mostly by bit, however, bodily fluids can also be a factor in infection.

They will be glassy eyed until someone gets their attention, then they will pursue that individual until they either catch them, lose track of them or are killed.

They are mindless at this point.

Sickly skin

If allowed to survive for over 4 hours, that will start to show signs of which Zombie level 2 it will become.

Both types of zombies are just starting out. They aren't that treating compared to the higher level Biological Zombie but they are persistent if possible kill them in this stage, as they only get stronger from here as the Virous-Z rebuilds their bodies.
Walkers:

Crawlers:

Minimum requires Biological waste, can adapt to whatever environment they are in.

Don't get bitten, or let their bodily fluids get into any wound.

Biological Zombie

Death, at this stage, if you severe an artery of the zombie you'll kill it.

If you wish to kind an individual under control, you could give them high doses of sedatives. However, the longer the patient is infected with Biological Zombie, the faster they will burn through the sedatives.

0

It will be hard for anyone to kill a friend while they look somewhat normal.

Every victim of Virous-Z will start out at this stage.

Virous-Z

Zombie level 2