1976 Clara Maass - Malaria - Block Of 4 13c Postage Stamps - Sc# 1699 - MNH, OG - CT43a
Clara Louise Maass (June 28, 1876 - August 24, 1901) was an American nurse who died as a result of volunteering for medical experiments to study yellow fever. In March 1901, Maass volunteered to be bitten by a mosquito that had been allowed to feed on yellow fever patients. By this time, the researchers were certain that mosquitoes were the route of transmission, but lacked the scientific evidence to prove it because some volunteers who were bitten remained healthy. Maass continued to volunteer for experiments. On August 14, 1901, Maass allowed herself to be bitten by infected mosquitoes for the second time. Researchers were hoping to show that her earlier case of yellow fever was sufficient to immunize her against the disease. Unfortunately, this was not the case. Maass once again became ill with yellow fever on August 18 and died on August 24. Her death roused public sentiment and put an end to yellow fever experiments on human beings.
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