Toxoplasmosis as a cause of ovine perinatal mortality

Hartley, W. J.; Marshall, S. C.

doi:10.1080/00480169.1957.33275

Cited by 110 publications

(29 citation statements)

References 5 publications

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“…Abortion storms, presumed to be associated with a wave of primary infection with Toxoplasma, have been known to occur (Hartley & Marshall, 1957) and it is suggested that these outbreaks can be attributed to contact between the flock and infected cats during gestation. By using PCR positivity of the Toxoplasma SAG 1 gene as a measure of infection with Toxoplasma, our data clearly show that vertical transmission occurs in 60-70 % of all pregnancies and that this figure remains consistent through time, and with season, breed and geographical area.…”

Section: Discussionmentioning

confidence: 99%

High levels of congenital transmission of Toxoplasma gondii in longitudinal and cross-sectional studies on sheep farms provides evidence of vertical transmission in ovine hosts

et al. 2005

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Recent research suggests that vertical transmission may play an important role in sustaining Toxoplasma gondii infection in some species. We report here that congenital transmission occurs at consistently high levels in pedigree Charollais and outbred sheep flocks sampled over a 3-year period. Overall rates of transmission per pregnancy determined by PCR based diagnosis, were consistent over time in a commercial sheep flock (69 %) and in sympatric (60 %) and allopatric (41 %) populations of Charollais sheep. The result of this was that 53. 7% of lambs were acquiring an infection prior to birth: 46. 4% of live lambs and 90. 0 % of dead lambs (in agreement with the association made between T. gondii and abortion). No significant differences were observed between lamb sexes. Although we cannot distinguish between congenital transmission occurring due to primary infection at pregnancy or reactivation of chronic infection during pregnancy, our observations of consistently high levels of congenital transmission over successive lambings favour the latter.

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Section: Discussionmentioning

confidence: 99%

High levels of congenital transmission of Toxoplasma gondii in longitudinal and cross-sectional studies on sheep farms provides evidence of vertical transmission in ovine hosts

et al. 2005

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“…In cats this period is 3-5 days after feeding parenteral meronts ("cysts"), 7-10 days after feeding merozoites, and 20-24 days after feeding fecal oocysts Dubey, Miller, and Frenkel, 1970b), 2-7 days after feeding "cysts" from mice, and 7 days or more after feeding oocysts from cats (Witte and Piekarski, 1970 (Frenkel, 1973). The total cost of neonatal human toxoplasmosis in the United States was estimated by Frenkel (1973) (Hartley and Marshall, 1957;Kater, 1963, 1964). Levine (1973) and Beverley (1974) (Sabin and Feldman, 1948;Sabin et al, 1952), complement fixation test (Warren and Sabin, 1943;Sabin, 1949), hemagglutination test (Jacobs and Lunde, 1957), skin test (Frenkel, 1948(Frenkel, , 1949, fluorescine-labeled antibody test (Goldman, Carver, and Sulzer, 1957), and latex agglutination test (Lunde and Jacobs, 1967).…”

Section: Host Genus Potosmentioning

confidence: 99%

The coccidian parasites (Protozoa, Apicomplexa) of carnivores

Levine¹,

Ivens²

1981

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“…Toxoplasma gondii infection has been recognized as a significant cause of ovine perinatal mortality and reproductive failure for at least 50 years (Hartley & Marshall 1957). Production of sheep is an important economic activity for several families in Tocantins state, but data regarding the occurrence of toxoplasmosis in Brazilian Legal Amazon (BLA) region are really scarce.…”

Section: Discussionmentioning

confidence: 99%