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Biomedical subjects

D E Jacobs

Publications and source records attributed to D E Jacobs.

At least 109 records · Page 6Linked to original sources
PubMed1982

Epidemiology of Uncinaria stenocephala infections in greyhound breeding kennels.

Field observations at breeding kennels in eastern England support the view that perinatal transmission is of minor importance in the epidemiology of Uncinaria stenocephala infections in greyhounds. Patent infections became established soon after weaned pups were put onto gas paddocks. Egg-counts rose to high levels, tending to peak in dogs 25-35 weeks old and to decline thereafter. This pattern was related to the age of the host and was not seasonal. The consequent deposition of large numbers of eggs onto the paddocks at irregular intervals distorted the seasonal fluctuations in herbage larval counts previously found to be a consistent feature of grass paddocks used for exercising adult racing greyhounds.

Animals↗
PubMed1980

Factors influencing uptake of nematode larvae in adult dairy cattle during the grazing season and sources of pasture contamination.

Investigations on nine well managed English dairy farms showed that 85.2 per cent of 460 adult cows harboured patent nematode infections, although the worm burdens, as judged by faecal egg counts, were small. Infection took place primarily by the ingestion of grass previously contaminated either directly with bovine faeces or indirectly with slurry. Calves did not appear to contribute to the infectivity of land grazed by adults on these farms. The parasitic challenge to which cows were exposed was dependent upon the feeding regime, grassland management and the season of the year. Generally the intake of infective larvae ranged from 0 to 1500 per day but daily intakes of up to 4520 were recorded.

Animal Feed↗
PubMed1977

Toxocara infection in pigs. The use of indirect fluorescent antibody tests and an in vitro larval precipitate test for detecting specific antibodies.

An in vitro larval precipitate test using second-stage Toxocara canis larvae and an indirect fluorescent antibody (IFA) test employing cuticles of T. canis larvae as antigen were evaluated using antisera produced in pigs experimentally infected with T. canis, T. cati, Ascaris suum, Toxascaris leonina and Parascaris equorum. The former test was both specific and sensitive and is suggested as a reliable and simple method of detecting Toxocara antibodies in pigs. The latter test was considered unsuitable because of cross-reactions that occurred when sera from pigs infected with other ascarids were tested. An IFA test for Ascaris antibodies, employing cuticles of A. suum larvae as antigen, is described. The degree of specificity of this test suggests that it may be of value in the detection of antibodies to Ascaris in pigs under natural conditions.

Animals↗
PubMed1976

Studies on the epidemiology of Uncinaria stenocephala infections in British greyhounds: seasonal availability of larvae on grass runs.

The numbers of Uncinaria stenocephala larvae on the grass in a small paddock used continually for exercising greyhounds followed the seasonal pattern associated with gastro-intestinal nematodes of ruminants, pigs and horses in Britain. Contamination persisted throughout the winter months but near-zero values were recorded in the early summer, followed by a rapid rise in mid-July to a peak level in September.

Animals↗