Castor Bean Tick, Ixodes ricinus (IMAGE) PLOS Caption Anaplasmosis bacterium tinkers with tick's gene expression to spread to new hosts. Credit Erik Karits, Pixabay Usage Restrictions CC0 - No copyright, public domain, free use 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.