Denis S Atkinson

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AIMS To test the hypotheses that when untreated adult ewes are rotationally grazed (follow behind) on pastures after lambs receiving routine anthelmintic treatments, the ewes can function as a source of unselected parasites in refugia, capable of slowing the development of anthelmintic resistance, and suppress the build-up of parasites resulting from the(More)
PURPOSE An association between morning glory disk anomaly (MGDA) and intracranial vascular anomalies including Moyamoya disease has been recognized. We evaluated a series of patients with MGDA to ascertain the frequency of cerebrovascular anomalies. DESIGN Retrospective observational case series. METHODS We reviewed the neurologic histories and(More)
AIM To determine whether drenching regimes for lambs by which a proportion (10%) of the heaviest animals was selectively left untreated, or animals are only drenched 'on demand' when faecal nematode egg counts (FEC) exceeded a threshold level, would result in measurable increases in parasite larval challenge in the autumn and/or decreases in the performance(More)
AIM To test the theory that creating a reservoir of unselected worms by leaving a proportion of lambs in a flock untreated with anthelmintic, i.e. in refugia, will slow the development of anthelmintic resistance in nematode parasite populations. METHODS Newly weaned Romney lambs (n=180) were infected with two nematode parasite species, Teladorsagia (=(More)
AIMS To test the hypothesis that peri-parturient anthelmintic treatment of adult ewes, either pre-lambing with a controlled- release capsule (CRC) or at tail-docking with a short-acting oral formulation, would increase the rate of development of anthelmintic resistance, as compared to not drenching ewes and giving an additional drench to lambs in the(More)
AIMS To determine whether: a) using a controlled-release anthelmintic capsule (CRC) instead of a programme of 5 oral drenches administered at 3-4 week intervals, would delay the development of anti-parasite immunity in lambs; b) the use of ivermectin instead of albendazole, administered either as a CRC or as a programme of 5 oral drenches, would delay the(More)
AIM To determine whether the fungicide, carbendazim, as applied to pastures for controlling facial eczema (FE), would inhibit development of the free-living stages of the gastrointestinal nematode parasite Trichostrongylus colubriformis. METHODS Two studies were conducted, using sheep faeces containing eggs of T. colubriformis. In the first, the faeces(More)
The causes of stroke in the children are varied. Magnetic resonance imaging (MRI) is generally accepted as the study of choice for definitive diagnosis of ischemic injury. However, often times MRI is not immediately available in the acute setting. This review highlights some of the major causes of stroke in children and the current role of computed(More)
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