 The disease is present in 18 countries on the American continents , ranging from the southern United States to northern Argentina . Chagas exists in two different ecological zones . In the Southern Cone region , the main vector lives in and around human homes . In Central America and Mexico , the main vector species lives both inside dwellings and in uninhabited areas . In both zones , Chagas occurs almost exclusively in rural areas , where triatomines breed and feed on the more than 150 species from 24 families of domestic and wild mammals , as well as humans , that are the natural reservoirs of T. cruzi . 
 The disease <a href='drop_aux' title='1'><mark>is</mark></a>present in 18 countries on the American continents , ranging from the southern United States to northern Argentina . Chagas <a href='uninflect' title='2'><mark>exists</mark></a> in two different ecological zones . In the Southern Cone region , the main vector <a href='uninflect' title='3'><mark>lives</mark></a> in and around human homes . In Central America and Mexico , the main vector species <a href='uninflect' title='4'><mark>lives</mark></a> both inside dwellings and in uninhabited areas . In both zones , Chagas <a href='uninflect' title='5'><mark>occurs</mark></a> almost exclusively in rural areas , where triatomines breed and feed on the more than 150 species from 24 families of domestic and wild mammals , as well as humans , <a href='null_relcl' title='6'><mark>that</mark></a><a href='drop_aux' title='7'><mark>are</mark></a>the natural reservoirs of T. cruzi . 
Da disease present in 18 countries on the American continents , ranging from the southern United States to northern Argentina . Chagas exist in 2 different ecological zones . In the Southern Cone region , the main vector live in and around human homes . In Central America and Mexico , the main vector species live both inside dwellings and in uninhabited areas . In both zones , Chagas occur almost exclusively in rural areas , where triatomines breed and feed on the more than 150 species from 24 families of domestic and wild mammals , as well as humans , tdanatural reservoirs of T. cruzi .