En 1998, William Birkin, el padre de Sherry, decidió no compartir con nadie los resultados de su investigación sobre el virus G. Sus jefes de Umbrella se cansaron de su actitud y mandaron un comando para arrebatarle las muestras del virus. Dicha misión coincidió con el brote de virus T que asoló Raccoon City. La confluencia de estos dos acontecimientos contribuyó en gran medida a que la ciudad quedase destruida.
Sherry Birkin también se vio envuelta en el embrollo, pero gracias a los esfuerzos de Leon S. Kennedy y Claire Redfield logró sobrevivir al incidente. Tras perder a sus padres, Claire se convirtió como en una madre para Sherry. El amor y la devoción de Claire la influenciaron mucho, y por ello a veces las acciones de Sherry recuerdan a la personalidad compasiva de Claire.
In 1998, William Birkin, father of Sherry Birkin, decided to keep the results of his G-Virus research for himself. His superiors at Umbrella had grown tired of his attitude and sent a commando unit to retrieve the virus for them. The unit's mission coincided with the T-Virus leak that had contaminated Raccoon City. The confluence of the two events contributed greatly to the city's destruction.
Sherry Birkin was also caught up in these events, but thanks to the heroic efforts of Leon Kennedy and Claire Redfield, she was able to survive the incident. Sherry considered Claire to be her new mother after losing both her parents. It was Claire's love and devotion that had the greatest impact on Sherry's development, and Claire's nurturing and compassionate ways have manifested themselves in Sherry's own personality. Sherry and Claire both led very busy lives, but Sherry still made an effort to try and meet when their schedules allowed it.
Below is an e-mail addressed to Claire, but accidentally sent to a co-worker.
I was able to get some days off at the end of next month when you said you'd be in America. I have so much I want to talk to you about. I can't wait to see you!
I'll send Ronny a message, too. I bet he'll be excited to hear you're coming back!