Heligmosomoides polygyrus (image) University of California - San Francisco Share Print E-Mail Caption An adult female H. polygyrus, like the parasites used in this study. Credit Photo courtesy of Joel Bowron. Usage Restrictions None Share Print E-Mail 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.