Facts About All Zombies

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How People Turn

They are bitten by an infected person.
Transmission is still unclear however based on given clues, infection appears to be through fluid exchange via spit or blood contact into the blood stream. A Tower residents journal revealed that fluid to undamaged skin contact had no affect.
Early in the story Riley says that she and Pegs witnessed people being attacked and may come in contact with infected blood and turned.

How the Zombies Can Tell Where People Are

Certain zombies have an acute sense of hearing, however some are deaf but have a good sense of smell.
Attracted to the smell of pheromones and human blood.
Their sense of smell can be thrown off by chemicals with a strong scent, ie perfume, alcohol.
Alcohol seems to repell zombies.

Notable Facts

Zombies rest and/or sleep.
The zombies are cannibals.
Animals cannot turn.
Zombies can build a tolerance to homemade chloroform.
Some zombies take more than one bullet to bring down.
Carries their dead and deceased victims back the the Arena where they are either eaten or burned or both.
Not all zombies use the the Arena as a home base. Some prefer to live on an island, etc.
Clear distinction between zombies that lead and zombies that follow.
Burt mentioned that he believes that the smarter you were in life, the smarter you are as a zombie.
Based on the descriptions from the main characters journals, the "zombies" are all described as having some sort of deformity or super human strength or ability.