(IMAGE) McGill University Health Centre Caption This image shows the parasite Leishmania (top centre) being ingested by a macrophage -- type of cell at the front lines of our body's defense against foreign invaders. Credit Dr. Martin Olivier Usage Restrictions Credit author 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.