As the 20th century evolved, rational man turned to science to explain mythology that had pervaded for thousands of years. Science, in time, came back with answers that may surprise you.
Red cells are the carriers of oxygen throughout the body.
When a person suffers from anemia, their symptoms are caused by inadequate oxygen. Over the ages, a person suffering from these symptoms may have been under suspicion of a vampire attack. Once again, myth warps to suit the needs of the believer. Although the victim may have contracted a disease or simply have inherited the blood disorder, society would have found it easy to believe that the symptoms resulted from a vampire attack. Indeed, these symptoms may even have suggested to our ancestors that the victim was beginning his own transition to a vampire, marked with a pale complexion and trouble eating food.