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dc.creatorMavrogianni, V. S.en
dc.creatorFthenakis, G. C.en
dc.creatorBrooks, H.en
dc.creatorPapaioannou, N.en
dc.creatorCripps, P. J.en
dc.creatorTaitzoglou, I.en
dc.creatorBrellou, G.en
dc.creatorSaratsis, P.en
dc.date.accessioned2015-11-23T10:39:09Z
dc.date.available2015-11-23T10:39:09Z
dc.date.issued2005
dc.identifier10.1051/vetres:2004048
dc.identifier.issn0928-4249
dc.identifier.urihttp://hdl.handle.net/11615/30820
dc.description.abstractThe objectives of the work described in this paper were: (i) to study the outcome of challenging ewes with Mannheimia haemolytica, at different sites of their teats, (ii) to compare the effects of two different isolates of the organism and (iii) to describe the features of the resulting lesions. Thirty-two ewes were used in the study and allocated into one of two groups (A or B, n = 16); they were challenged with one of two isolates of M. haemolytica, respectively, strain ES26L of known pathogenicity or strain VSM08L from the teat duct of a healthy ewe. Each group was further divided into four equal subgroups: the ewes in the A1/B1 subgroups were intramammarily challenged; one teat of the ewes in the A2/B2 subgroups was immersed into a broth-culture of the organisms; one teat of the ewes in the A3/B3 subgroups was inoculated 2 mm-deep, whilst one teat of the ewes in the A4/B4 subgroups was inoculated 6 mm-deep. The animals were monitored clinically, bacteriologically and cytologically before and after challenge; one animal in each subgroup was euthanised 2, 4, 7 and 11 days after challenge. All ewes in the A1/B1 subgroups developed clinical mastitis, whilst of the other animals, only one ewe in each of the A4/B4 subgroups did. Neither of the two strains used was associated with more positive bacteriological or CMT results; the A2/B2 subgroups were associated with less positive results than the A3/B3 and A4/B4 subgroups. In some ewes of the A2/B2 subgroups, mild leucocytic infiltration in the teat was evident; in the ewes of the A3/B3 subgroups, leucocytic infiltration (neutrophils, lymphocytes, plasma cells) was seen, as well as a lymphoid hyperplasia at the border between the teat duct and teat cistern; in ewes of the A4/B4 subgroups, intense subepithelial leucocytic infiltration was the salient feature. No differences were found in the severity of lesions between the two strains used or the three treatments carried out. Although strain VSM08L had been isolated from the teat duct of a healthy ewe, it caused mastitis when inoculated intramammarily; although strain ES26L is of known pathogenicity for the mammary gland, it did not cause clinical mastitis when deposited 2 mm-deep into the teat. These findings point to a protective role of the teat of ewes, which appear to limit bacterial penetration from the teat duct or cistern to the mammary gland. The lymphoid tissue, at the border between the teat duct-teat cistern, may play a significant protective role.en
dc.sourceVeterinary Researchen
dc.source.uri<Go to ISI>://WOS:000225889200002
dc.subjectMannheimia haemolyticaen
dc.subjectsheepen
dc.subjectmastitisen
dc.subjectteaten
dc.subjectdefence mechanismsen
dc.subjectCOAGULASE-NEGATIVE STAPHYLOCOCCIen
dc.subjectBOVINE MAMMARY-GLANDen
dc.subjectPASTEURELLA-HAEMOLYTICAen
dc.subjectSUBCLINICAL MASTITISen
dc.subjectINDUCED INFLAMMATIONen
dc.subjectDEFENSE-MECHANISMSen
dc.subjectEND TISSUESen
dc.subjectSHEEPen
dc.subjectUDDERen
dc.subjectENHANCEMENTen
dc.subjectVeterinary Sciencesen
dc.titleThe effects of inoculation of Mannheimia haemolytica into the teat of lactating ewesen
dc.typejournalArticleen


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