 Dense vegetation ( such as that of tropical rainforests ) and urban habitats are not ideal for the establishment of the human transmission cycle . However , in regions where the sylvatic habitat and its fauna are thinned by economic exploitation and human habitation , such as in newly deforested areas , piassava palm culture areas , and some parts of the Amazon region , a human transmission cycle may develop as the insects search for new food sources . 
 Dense vegetation ( such as that of tropical rainforests ) and urban habitats <a href='negative_concord' title='1'><mark>are</mark></a> <a href='negative_concord' title='2'><mark>not</mark></a>ideal for the establishment of the human transmission cycle . However , in regions where the sylvatic habitat and its fauna are thinned by economic exploitation and human habitation , such as in newly deforested areas , piassava palm culture areas , and some parts of the Amazon region , a human transmission cycle may develop as the insects search for new food sources . 
Dense vegetation ( such as dat of tropical rainforests ) and urban habitats ain't ideal for da establishment of the human transmission cycle . However , in regions where tdasylvatic habitat and its fauna r thinned by economic exploitation and human habitation , such as in newly deforested areas , piassava palm culture areas , and sum parts of thdamazon region , a human transmission cycle may develop as thedaaches search for new food sources .