Trypanosoma brucei Parasite (image) DOE/SLAC National Accelerator Laboratory Caption Colored electron micrograph of the bloodstream form of the Trypanosoma brucei parasite (light blue) that causes African trypanosomiasis (also called sleeping sickness) in humans in the presence of erythrocytes (red) and lymphocytes (yellow). After infection of the mammalian host by bite of the tsetse fly, the parasite lives within the bloodstream, before it invades the central nervous system and the brain to cause fatal effects. Credit Michael Duszenko / University of Tübingen Usage Restrictions Provide credit 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.