We propose a simple assay to assess the importance of seven vertebrate species as food sources for Mepria spinolai, a wild arthropod vector of Trypanosoma cruzi (the agent of Chagas’ disease). Rabbits were immunized with serum proteins from one of each of the seven species. After titration, a consensus 1/ 100,000 dilution of the immune sera detected vertebrate serum proteins in the intestinal contents of 48.9% of 131 insects tested...
