It is believed to be haunted, by patients who died of the plague in Europe, and a crazy doctor who is said to have tortured the patients, performing useless experiments that many of his patients never survived.

It is difficult to determine the exact percentage of amputation patients who survived during the Napoleonic Wars as precise records were not consistently kept. However, advances in surgical techniques and the use of anesthesia during this time increased the chances of survival for amputation patients compared to previous wars. It is estimated that the survival rate for amputations during the Napoleonic Wars was around 75-80%.

I think it's because of the patients whose brains got damaged by the Doctor's electro therapy, and she was an accomplice, maybe...These patients must have been found when the place burned down and everyone but the doctor survived.

James Fortune & Fiya - You Survived

No known cures for ebola have been found, but there is an experimental ebola drug that was given to an American doctor who contracted the disease while working with patients in Africa. The doctor survived.