Lyme and other tickborne diseases are on the rise in the U.S. Here’s what that means.
An infectious disease physician answers questions about the increase in cases
![blacklegged tick Ixodes scapularis](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/11/111518_ac_tick-qa_feat.jpg?fit=860%2C460&ssl=1)
PERSISTANT PEST The bacteria that cause Lyme disease are spread by infected ticks, including the blacklegged tick Ixodes scapularis.
Scott Bauer, USDA Agricultural Research Service/Bugwood.org (CC BY 3.0)