Blacklegged Tick (IMAGE) Indiana University Caption Deer ticks, also known as blacklegged ticks, are a common carrier for the bacteria that cause Lyme disease. Credit Image courtesy USDA ARS Usage Restrictions None 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.