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Evidence that primary infection of Charollais sheep with Toxoplasma gondii may not prevent foetal infection and abortion in subsequent lambings.

Abstract：

:A study carried out on a sheep farm examined whether Toxoplasma gondii foetal infection and associated abortion occur in successive lambings. We identified 29 ewes that gave birth to lambs on at least 2 successive years over our study period, 2000-2003. Tissue samples from the progeny of these ewes were analysed by PCR to determine infection status with T. gondii. T. gondii-infected lambs were born in 31% of successive pregnancies. T. gondii-positive lambs were aborted in successive pregnancies in 21% of lambings during study period, 2000-2003. The frequency of successive abortions within this flock over the period 1992-2003 was 18%. If a lamb was congenitally infected there was a high risk (69%) that the successive lamb from that ewe would also be congenitally infected. Similarly, if a lamb was aborted there was a high risk (55%) of abortion in the next lamb produced. These data suggest that life-long immunity to T. gondii infections may not always be acquired following an initial infection and raises the question as to whether the mechanisms of T. gondii transmission prior to and during ovine pregnancies are fully understood.

journal_name

Parasitology

journal_title

Parasitology

authors

Morley EK,Williams RH,Hughes JM,Thomasson D,Terry RS,Duncanson P,Smith JE,Hide G

doi

10.1017/S0031182007003721

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

169-73

issue

2

eissn

0031-1820

issn

1469-8161

pii

S0031182007003721

journal_volume

135

pub_type

杂志文章

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