Table 1.

Characteristics of the different T. cruzi populations, based on the current classification into discrete type units (DTUs)

DTU	Pathogenicity in mice	Sensitivity to anti- trypanosome drugs	Transmissibility through triatomine vectors	Cycle	References
I	High pathogenicity	Low sensitivity	High transmissibility	Domestic and sylvatic	(12), (13), (14), (15), (16).
II	Low pathogenicity	High sensitivity	Low transmissibility	Domestic	(17, 18), (13), (14), (15), (16).
III	ND	ND	ND	Sylvatic	(17)
IV	ND	ND	ND	Sylvatic	(17)
V	Low pathogenicity	High sensitivity	Low transmissibility	Domestic	(17), (13), (14), (16).
VI	-	-	-	Domestic	(17, 18)

ND= Not determined