 Various <unk> for T. cruzi are available and can be used to distinguish among strains ( <unk> of <unk> with <unk> <unk> ) . These tests include : detecting complement <unk> , indirect <unk> , indirect fluorescence assays , <unk> , and <unk> . Alternatively , diagnosis and strain identification can be made using polymerase chain reaction ( <unk> ) . 
