Fiona Douglas testing the virus on Abby Grant.
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Working closely with James Whitaker, Fiona is an expert in virology and the Lab's best hope of finding a vaccine to treat the European Flu.
When all the lab's scientists are dead, and Fiona was the only one immune, the Family find her and ask her about the new vaccine. She tested the vaccine on Al and the signs were positive. They kept Whittaker prisoner and then Fiona traitors the Family for Whittaker. The two of them are going to see Landry.
Fiona is shot by Peter Grant accidently when he thought he was under attack.