![close up of deer tick from above on pink background.](https://static.scientificamerican.com/dam/m/efc111f7459457/original/GettyImages-128107380.jpg?w=450)
Spike in Lyme Disease Cases Reflects More Accurate Surveillance
In states with high rates of Lyme disease, new reporting guidelines have revealed tens of thousands of previously overlooked cases--giving scientists a better understanding of the public health threat