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. 2001 Sep;39(3):227-32.
doi: 10.3347/kjp.2001.39.3.227.

Experimental induction of the two-host life cycle of Sarcocystis cruzi between dogs and Korean native calves

S H Wee  1 , S S Shin
Affiliations

Experimental induction of the two-host life cycle of Sarcocystis cruzi between dogs and Korean native calves

S H Wee et al. Korean J Parasitol. 2001 Sep.

Abstract

Eight dogs were experimentally infected with Sarcocystis by oral inoculation of cardiac muscle from naturally infected cattle. The infected dogs commenced discharging of sporocysts in the feces after 10 to 12 days of inoculation, and continued until 20 and 35 days after inoculation. Three dogs were reinfected with cardiac muscle from the naturally infected cattle. Sporocysts reappeared in the feces on 12 to 13 days after reinfection. Sarcocystis sporocysts collected from the experimentally infected dogs were fed to each of the two 30-day-old Korean native calves. The infected calves remained clinically normal, except for the high fever (> or = 40 degrees C) and decreased hematocrit values on day 30 to 40 post inoculation. Muscular cysts of Sarcocystis were found from infected calves on day 40 post inoculation. Proliferative forms of Sarcocystis were also observed in the muscle of infected calves. These results suggest that the Sarcocystis cruzi found in Korean native cattle has a 2-host life cycle with dogs as the definitive host and Korean native calves as the intermediate host.

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Figures

Fig. 1
Fig. 1
Patterns of sporocyst excretion in the feces of dogs inoculated with 300 gm of cardiac muscle of cattle infected with Sarcocystis cruzi.
Fig. 2
Fig. 2
Patterns of sporocyst excretion of three dogs fed with 300 gm of cardiac muscle from infected cattle on 50 days after first infection.
Fig. 3
Fig. 3
Rectal temperature of Korean native calves experimentally infected with Sarcocystis cruzi sporocysts isolated from experimentally infected dogs.
Fig. 4
Fig. 4
Patterns of packed cell volume of Korean native calves experimentally infected with Sarcocystis cruzi sporocysts isolated from experimentally infected dogs.
See this image and copyright information in PMC

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