Excrement Infested with Roundworm (IMAGE) University of Basel Caption This is excrement of human or swine infested with roundworm (Ascaris sp.) and whipworm (Trichuris sp.). Credit University of Basel, IPAS Usage Restrictions None License Licensed 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.