Many Ebola patients in West Africa have begun to purchase the blood of Ebola survivors on the black market to increase their chances of survival.CNN reports that Ebola survivors’ blood is referred to as “convalescent serum,” and is said to possess antibodies that can fight the virus. However, efficacy of the treatment is unproven.The serum has been used to treat some patients, including Rick Sacra, an American aid worker. The blood of Kent...