Siddiqui-1.jpg (IMAGE) Texas Tech University Health Sciences Center Caption TTUHSC’s Afzal A. Siddiqui., Ph.D., began developing a schistosomiasis vaccine began in 1991 as a humanitarian effort. In May, the first dose of SchistoShield® vaccine was delivered into the arm of a human being, kicking off Phase 1 clinical trials. Credit TTUHSC Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.