It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
NOTE: CDC's DPDx webpage for Laboratory Identification of Parasites of Public Health Concern has been moved to https://www.cdc.gov/dpdx/index.html. See the Parasites A-Z Index to locate diagnostics for a parasite.