Blood Sucking Leeches
The idea behind using leeches was that they could help remove “bad blood” from the body, which was believed to be the cause of many illnesses. The leeches were placed on the patient’s skin, and they would attach themselves and begin to feed on the blood. As they fed, they would release a natural anticoagulant, which prevented the blood from clotting and allowed the leeches to feed for longer. The belief was that the leeches would remove infected blood from the body, thus helping to cure the disease. However, using leeches to treat the plague was largely ineffective, and removing blood from the body did not address the underlying cause of the disease. Today, leeches are still used in some medical treatments, such as reconstructive surgery and the treatment of blood clots. They are not used as a treatment for the plague or other infectious diseases.