Field studies © Charité | Andres Moreira-Soto (IMAGE) Charité - Universitätsmedizin Berlin Caption Charité researcher examines a rodent trap in Costa Rica. Credit © Charité | Andres Moreira-Soto Usage Restrictions This image may be used for coverage of the accompanying press release, provided that full credit is given. License Original 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.