Citizen science to complement the surveillance of Triatominae (Hemiptera: Reduviidae) with data of Trypanosoma cruzi (Kinetoplastea: Trypanosomatidae) infection and spatial distribution models in northeast Mexico.

The primary transmission of Trypanosoma cruzi, causative agent of Chagas disease, to humans and animals is through the feces and urine of Triatominae. Therefore, knowledge of their ecology and distribution is crucial for establishing effective surveillance programs with citizen participation. This is coupled with geographic distribution models to predict the risk of transmission in the areas most affected by Chagas disease. Therefore, this study aims to: a) document and validate citizen participation on the iNaturalist in the collection and observation of triatomines, as well as exploring risk factors; b) detect natural T. cruzi infection in triatomines using molecular and parasitological methods; c) to review the historical and recent literature of Triatoma gerstaeckeri (Stål 1859) in Mexico, and d) develop current and potential distribution models of T. gerstaeckeri to infer risk zones for parasite transmission in Mexico. Data of T. gerstaeckeri were collected from three sources: iNaturalist (n = 87), fieldwork data (n = 68), and scientific articles and theses (n = 882). iNaturalist observations were validated from photographs, specimen capture, and distribution overlap. The prevalence of natural infection by T. cruzi was 21.73 % (5/23) in T. gerstaeckeri from Nuevo Leon, with DTU strains TcI and TcIII, the first reports of DTU in the state. Citizen participation data like iNaturalist can potentially document the presence of triatomines at broad spatial scales. Still, they also represent an opportunity to engage and educate the public in the surveillance and control of these insect vectors associated with Chagas disease.