A pcr was used to detect the genome of Chlamydophila abortus in samples of uterine tissue collected from 304 sheep by a sterile technique at an abattoir. The stage of pregnancy of the sheep was determined by measuring the dimensions of the embryo/fetus, and its morphology was recorded. Only samples from non-pregnant sheep and sheep up to 100 days of gestation were retained; the clinical history of the animals was unknown. The total prevalence of the chlamydial genome was 30·9 per cent, with a significantly higher prevalence in the pregnant animals (46·9 per cent). Higher detection rates were recorded during early gestation than during mid-gestation.
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