PubMed Health⌕ Search

Biomedical subjects

W A Ellis

Publications and source records attributed to W A Ellis.

101 records · Page 6Linked to original sources
PubMed1976

Bovine leptospirosis: a serological and clinical study.

Antibodies to serotypes representing one or more of 10 Leptospira serogroups were detected in the sera of 1766 (49-1 per cent) cows and heifers out of a total of 3600 sera tested. Infection by the Hebdomadis serogroup was the predominant infection; antibodies to serotype sejroe were found in 1503 (41-8 per cent) sera. Antibodies to the Icterohaemorrhagiae (7-7 per cent) and Balllm (7-3 per cent) serogroups were the next most common, while antibodies to the Australis, Javanica, Canicola, Panama, Cynopteri, Pyrogenes and Autumnalis serogroups were detected in a small number of animals. Only the Hebdomadis and Icterohaemorrhagiae serogroups were associated with clinical disease.

Abortion, Veterinary↗
PubMed1976

Bovine leptospirosis: infection by the Hebdomadis serogroup and mastitis.

An outbreak of mastitis involving approximately 70 out of 140 cows over a two-month period is described. Common mastitis pathogens were not incriminated. Leptospires belonging to the Hebdomadis serogroup were isolated from the milk of three out of five cows and the blood of two of those cows.

Animals↗
PubMedDate not supplied

Development of an immunomagnetic antigen capture system for detecting leptospires in bovine urine.

A magnetic bead antigen capture system which combined the use of two evolving techniques - immunomagnetic separation (IMS) and time-resolved fluoroimmunoassay (TR-FIA) - was developed to detect Leptospira borgpetersenii serovar hardjo in bovine urine. The assay utilised monoclonal antibody coated magnetic beads to capture leptospiral antigen which was in turn detected using another monoclonal antibody (Indicator) labelled with biotin. Signal was generated by the binding of europium labelled streptavidin to indicator antibody. The sensitivity of the assay was improved from 10(3) to 10(2) leptospires per ml by using an ethanol precipitation procedure to treat each sample. The assay detected only 31 of 56 (55 per cent) urine specimens culture-positive for hardjo, but seven of 24 urine samples culture-negative for hardjo were identified as positive by the assay. These seven samples were from animals which were culture positive on at least one other occasion. These results suggest that this system should be further investigated as a complementary test to culture for the identification of hardjo carrier animals.

Animals↗