Unicellular Parasite Trypanosoma brucei (image) Umea University Share Print E-Mail Caption African sleeping sickness is caused by the unicellular parasite Trypanosoma brucei. Credit Illustration by Anders Hofer Usage Restrictions This illustration may only be used in contexts related to this news release. 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.