Mina Seward is based upon the character of Wilhelmina "Mina" Harker (née Murray) as first depicted in Bram Stoker's 1897 novel, Dracula.
Mina and her father and friends attended the symphony where she met the Transylvanian nobleman, Count Dracula. Mina was not nearly as impressed with the mysterious count as her friend Lucy was, and teased Lucy by mocking the count's thick Transylvanian accent.
That evening, Mina spent the night at Lucy Weston's place. It would be the last time she would ever see her friend alive. Dracula was not only a Transylvanian nobleman, but also a vampire, hungry for human blood. He fed from Lucy and killed her while Mina slept. A few nights later, Dracula entered Mina's room at the sanitarium and fed from her as well. He didn't take enough blood to kill her, but she awakened in a weakened state.
The following morning, Doctor Seward and John Harker examined her. Also in attendance was Doctor Seward's colleague, the occult scholar Professor Van Helsing. Wearing a scarf to conceal the bite wounds around her neck, Mina recounted a nightmare she had wherein she heard dogs howling and a thick mist filling the room. She also described a white face with piercing red eyes through the fog. Upon closer inspection, Professor Van Helsing discovered two small puncture wounds on the side of her neck. At this time, Dracula paid a visit to the Sewards and showed an interest in Mina's condition. It was then that Professor Van Helsing learned that Dracula was a vampire, though he was unable to take action against him directly.
Mina went out into the hospital gardens where she met Dracula. Enveloping her in his cape, Dracula bit Mina a second time. Moments later, a nurse discovered her and told the others that Mina was dead. They raced outside to attend her, but fortunately the nurse was mistaken and Mina was still alive.