Schistosomiasis snail vector (IMAGE) Texas Biomedical Research Institute Caption Biomphalaria glabrata are freshwater snails that are natural vectors of Schistosoma mansoni, one of the three main schistosome species infecting humans and responsible for schistosomiasis. Credit Texas Biomed Usage Restrictions Free to use with credit. 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.