Sure, here are some characters and their backgrounds: 

1. Dr. Bob: The chief medical officer of the Special Reinfection Division of the CDC. Dr. Bob is known for his expertise in treating and curing highly contagious diseases such as zombie infection. He has been working with the Division of Zombie Research to develop a vaccine for the Zombie Apocalypse that would prevent the spread of zombie infections.

2. Dr. Mendez: The head of the first-aid division of the CDC. Dr. Mendez is a well-respected medical expert who has developed a range of effective medical tools to help fight zombie infections. He has also been training other CDC staff in first-aid techniques to keep them ready for the Zombie Apocalypse.

3. Dr. Kurt: The Assistant Chief Medical Examiner for the state of California. Dr. Kurt is a renowned forensic pathologist who specializes in identifying and classifying physical evidence related to the causes of death in the Zombie Apocalypse.

4. Mercy Reznik: A survivor of the zombie apocalypse, Mercy Reznik is a survivor first-aid instructor with the Department of Bio-Engineered Entities. Mercy Reznik has also trained other survivors in medical first-aid techniques to deal with the zombie infection.

5. Olivia Jade: An infection control nurse who has been working in the Zombie Apocalypse for years. Olivia Jade is a hard-nosed and determined nurse who is known for her leadership skills in the Zombie Apocalypse.

6. Clementine “C.C.” Shaw: An outbreak containment specialist who works with the Special Refections Division of the CDC. Clementine C.C. Shaw is a high-ranking official in the CDC who is dedicated to containing the spread of the Zombie Apocalypse.

7. Shauna Smith: The ex-con officer who infiltrates the quarantine facility on the outskirts of Atlanta to help find survivors and bring them back to the CDC. Shauna Smith is a skilled hacker and tech expert who has been using her skills to track survivors down and help them heal.

These are just a few possible characters for a zombie outbreak story. The key is to have a mix of characters with different backgrounds and motivations, so that the story is challenging and engaging for the reader.
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