APHIS Asian Longhorned Tick Observation Data 2010-2020

NVSL tick observation data from APHIS (NVSL, 2020). NVSL is a national dataset of passive surveillance observations of tick species that impact animal health. NVSL samples are submitted  when a suspected ALT is observed by regulatory field veterinarians, state and university diagnostic laboratories, and Food Safety and Inspection Service veterinarians. Data was collected from host animals, including humans, and environmental sources such as tick drags, carbon dioxide (CO2) traps, and animal inspections. Ticks identified on animals that were recently imported into the U.S. are not included. The first observation of ALT occurred in August 2010 and data is current as of November 2020. Data includes tick species, date, state, source (environment vs host) and number of ALT by life stage.