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PubMed1981

Abortion and death in goats inoculated with Sarcocystis sporocysts from coyote feces.

Ten 75- to 105-day-pregnant does each were inoculated orally within 1 million (2 does), 10,000 (4 does), or 1,000 (4 does) sporocysts of Sarcocystis from coyote feces. Two does not inoculated with sporocysts served as controls. The 2 does inoculated with 1 million sporocysts died from acute sarcocystosis 21 and 22 days after inoculation (DAI), and each had 2 dead fetuses. The 4 does inoculated with 10,000 sporocysts were ill 19 to 33 DAI but survived; 1 aborted at 33 DAI, 1 had a live kid that died within 2 hours of birth 31 DAI, 1 aborted 2 dead fetuses 23 DAI, and 1 had a normal kid 56 DAI. The 4 does inoculated with 1,000 sporocysts and the 2 control does remained clinically normal and had normal kids. Does and their offspring were killed within 24 hours of parturition, and their tissues were examined histologically and microbiologically. Meronts of Sarcocystis were found in the maternal placenta of does inoculated with 1 million sporocysts. Sarcocystis was not found in the placenta, fetuses, or tissues of kids from does inoculated with 10,000 or 1,000 sporocysts, or from control does. Other abortifacient agents were not found in the placenta, fetuses, or kids from any does.

Abortion, Veterinary↗
PubMed1982

Quantitative parasitemia in calves fed Sarcocystis cruzi sporocysts from coyotes.

For the quantitation of parasitemia, seven 7- to 10-day-old calves were orally inoculated with 2 virulent isolates of Sarcocystis cruzi from coyotes. Three calves were each given 2.5 million sporocysts of the 1st isolate; these calves died 31, 35, and 33 days later. The other 4 calves were given 2, 1, 0.76, and 0.38 million sporocysts of the 2nd isolate; these calves died or were euthanatized at 34, 44, 43, and 55 days after inoculation. Buffy coat smears from 7 ml of jugular blood of each calf were examined daily from day 14 after inoculation to time of necropsy. Merozoites were found in peripheral blood of all calves between days 25 and 46. The numbers of merozoites in 3 calves given identical inocula of the 1st isolate were 62, 48, and 17. The numbers of merozoites in the 4 calves given the 2nd isolate were 185, 11, 70, and 61, with decreasing dosages, respectively. The number of merozoites ranged from 0.14 to 9.8/ml of blood. More than 97% of merozoites were intracellular in mononuclear cells and 2.8% were extracellular in blood. Of 454 merozoites, 18 had 2 nuclei and 5 contained 2 dividing zoites; all dividing organisms were intracellular.

Animals↗
PubMed1982

Sarcocystosis in newborn calves fed Sarcocystis cruzi sporocysts from coyotes.

The development of Sarcocystis cruzi was compared in 3- to 14-day-old calves (n = 38) inoculated with 55,000 to 500,000,000 sporocysts from intestinal scrapings of coyotes, and euthanatized and necropsied on postinoculation days (PID) 4 to 153. From PID 15 to 19, the calves remained clinically normal, except for fever (greater than or equal to 40 C), during the development of 1st-generation meronts, and lesions in calves euthanatized at this time were confined mainly to mesenteric lymph nodes and consisted of focal necrosis due to vascular thrombosis. On PID 26, calves became sick, coincident with maturation and rupture of 2nd-generation meronts. In calves euthanatized from PID 26 to 28, the main lesion was hemorrhage in many organs and 1st- and 2nd-generation meronts were located subendothelially in unidentified cells between endothelium and tunica elastica. In calves euthanatized on PID 31, inflammation was pronounced in many tissues; this was also seen in calves euthanatized from PID 31 to 46 and corresponded to individual merozoites and the early development of sarcocysts. Inflammation began to subside by the time sarcocysts were recognizable (PID 67). Nonsuppurative hepatitis occurred in calves euthanatized from PID 15 to 153.

Animals↗