 <unk> treatment is most effective early in the course of infection , but is not limited to cases in the acute phase . <unk> of choice include <unk> or <unk> derivatives , such as benznidazole or nifurtimox . Both agents are limited in their capacity to completely eliminate T. cruzi from the body ( <unk> cure ) , especially in <unk> infected patients , and resistance to these drugs has been reported . 
