Vera Bennett contracted Hepatitis C because Joan Ferguson sacrificed her to prisoners. This act by Ferguson directly resulted in Vera acquiring the virus, a pivotal event that fueled Vera's determination to stop Ferguson.
This severe health consequence arose from a deliberate and manipulative action by Ferguson, who exposed Vera to circumstances within the prison that led to her infection. The discovery of her contracting hepatitis C due to Ferguson's machinations ignited a fierce ambition in Vera, compelling her to confront Ferguson's destructive influence.