Rabid Zombie

Rabid Zombie is the first zombie encountered in Abandoned House.

Effect
Although weaker than a normal zombie, Rabid Zombie is faster than one. It can bite a few other kinds of zombies, turning them into Rabid Zombies. They can only bite one zombie, the bitten ones can only bite one zombie, and so on. Only normal zombies, imps, conehead and buckethead zombies can be bitten. If any of the vulnerable kinds of zombies are bitten, they will still have the amount of health their uninfected equivalents have.

Almanac Entry
The thing is, most zombies can be distinguished from normal people, but no one can tell the difference between the sounds Rabid Zombie makes and bubbly water going down a drain.

Trivia
Rabid Zombies are the main zombies in the boss level of Abandoned House.