The hourly parasitaemia of Trypanosoma cruzi in mice with acute infection and in mice and guinea pigs with chronic infections was checked by means of hourly blood examinations and xenodiagnosis. The number of T. cruzi in the blood and the number of positive xenodiagnosis in both acute and chronic infections was frequent and variable but not cyclical during the 24 hours of the day. T. cruzi was demonstrable at any time of the day by either blood examination or xenodiagnosis.
Trypanosoma cruzi; Hourly Parasitaemia; Circadian rhythm; Xenodiagnosis