Records of Onchocerca found at postmortem examination of Welsh cattle

Webber, Winfrith A. F.; Crisp, G.; Wright, A. I.; Williams, Paul

doi:10.1016/0035-9203(57)90101-3

Cited by 5 publications

(2 citation statements)

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“…Surveys of 0. gutturosa infections in Great Britain have also been made by Webber et al (1957) and Venkataratnam & Kershaw (1961). Webber et al (1957) studied the infection rate in cattle slaughtered at an abattoir in North Wales, and found adults or the microfilariae of O. gutturosa in 25% of cattle imported from Ireland and 60% of cattle from Wales and Cheshire. About 20% of the cattle examined by Venkataratnam and Kershaw (1961) in a Liverpool abattoir were found to be infected.…”

Section: Infection Rate Of O Gutturosamentioning

confidence: 90%

Studies on Onchocerca gutturosa (Neumann, 1910) and its Development in Simulium ornatum (Meigen, 1818). I. Observations on O.gutturosa in cattle in South-East England

Eichler

Nelson

1971

J. Helminthol.

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1. O. gutturosa infections are of widespread occurrence in South-East England. 58% of 1583 cervical ligaments from milk cattle slaughtered in an abattoir at Reading, Berkshire, showed the presence of adult worms. A more detailed study of 50 cattle from a small abattoir near St. Albans in Hertfordshire showed 42 (84%) infected.2. The adult worms were found either in the connective tissue adjoining the nuchal ligament or between the spleen and rumen. There was no evidence of an increase in the parasite density with age of the cattle suggesting a strong immunity to superinfection.3. Irrespective of the situation of the adult worms the microfilariae of O. gutturosa appear to have a directional mechanism and were always concentrated in the skin around the umbilicus. This is an adaptation to transmission by Simulium ornatum which bites preferentially in the umbilical region.4. There were no marked pathological changes associated with the parasites and no evidence of clinical disease attributable to infection with O. gutturosa.

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Section: Infection Rate Of O Gutturosamentioning

confidence: 90%

Studies on Onchocerca gutturosa (Neumann, 1910) and its Development in Simulium ornatum (Meigen, 1818). I. Observations on O.gutturosa in cattle in South-East England

Eichler

Nelson

1971

J. Helminthol.

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“…Studying a similarly aged population in the south of England, EICHLER & NELSON (1971) found a much higher prevalence of infection at the ligamentum nuchae of 58% and 74% in two groups compared to 8-2% reported here and a higher mf infection rate at the umbilicus, 74% compared to 28-5%. By contrast, in cattle of undisclosed age from northern Britain, infection rates with adult worms at the ligamentum nuchae were about 4% at Liverpool abattoir (VENKATARATNAM & KERSHAW, 1961) and 18% at Wrexham abattoir (WEBBER et al, 1957). These figures suggest that the prevalence of O. gutturosa in northern England has not changed in the last 35 years and that it is substantially lower than that in southern England.…”

Section: Discussionmentioning

confidence: 93%

Onchocerciasis in British cattle: a study ofOnchocerca gutturosaandO. lienalisin North Wales

1987

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Onchocerca gutturosaandO. lienalisinflections in British cattle were studied by examination of cattle post-mortem originating from North Wales and Cheshire (north west England). In 463 adult animals, the microfilarial (mf) prevalence was 28·5%. In 95·3% of the inflected animals, gravid worms could not be found at either the ligamentum nuchae or the gastro-splenic omentum. Dermal mf at the head were identified asO. gutturosaon the basis of their highly significant assocation with the presence of gravidO. gutturosaat the ligamentum nuchae, which were found in only 3·2% of cattle. Mfs were isolated from different skin sites and from adult worms and a minimum of 10 mfs from each isolate were examined for width and acid phosphatase (AP) staining pattern. The width ofO. gutturosadermal mf was <4 μm (4 isolations), narrower than of putativeO. lienalismf isolated from umbilical skin of cattle without evidence ofO. gutturosa, which were in 20/22 isolations >4 μm wide. The dermal mf were also distinguished on the basis of different AP staining patterns which, for each species, correlated closely with that of hatched intrauterine mf from their respective adult female worms. Based on the criteria of morphology and AP staining patterns the mf species prevalences in the survey population were estimated asO. lienalis24·1% andO. gutturosa2·2%, with a further 2·2% of cattle inflected with both species. The results indicate that the predilection site of adultO. lienalisis not the gastro-splenic omentum. In North Wales, the distribution of the two species was different;O. lienaliswas widely distributed in all cattle rearing areas both lowland and upland, whereasO. gutturosawas largely restricted to valleys close to major rivers.

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Activity of two pyrethroids against blackfly larvae, determined by a simple laboratory technique

Brooke¹,

Holyome²

1970

Pestic. Sci.

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A simple laboratory technique for determining the activity of two pyrethroids (5‐benzyl‐3‐furyImethyl DL‐cis, trans‐chrysanthemate and 5‐benzyl‐3‐furylmethyl D‐trans‐chrysanthemate) against blackfly larvae (Simulium ornatum) is described. The results showed that the pyrethroids alone or with piperonyl butpxide were of similar activity to Abate (O,O,O',O'‐tetramethyl O,O'‐thiodi‐p‐phenylene phosphor‐othioate) and Dursban (O,O‐diethyl O‐3,5,6‐trichloro‐2‐pyridylphosphorothioate), insecticides of known activity against blackfly larvae. However, the pyrethroids cause rapid larval detachment in running water, and may be of value in controlling these insects when used in conjunction with another insecticide.

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Records of Onchocerca found at postmortem examination of Welsh cattle

Cited by 5 publications

References 0 publications

Studies on Onchocerca gutturosa (Neumann, 1910) and its Development in Simulium ornatum (Meigen, 1818). I. Observations on O.gutturosa in cattle in South-East England

Studies on Onchocerca gutturosa (Neumann, 1910) and its Development in Simulium ornatum (Meigen, 1818). I. Observations on O.gutturosa in cattle in South-East England

Onchocerciasis in British cattle: a study ofOnchocerca gutturosaandO. lienalisin North Wales

Activity of two pyrethroids against blackfly larvae, determined by a simple laboratory technique

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