Title: Detection of Mycoplasma conjunctivae in the eyes of healthy, free-ranging Alpine ibex : possible involvement of Alpine ibex as carriers for the main causing agent of infectious keratoconjunctivitis in wild Caprinae
Authors : Ryser-Degiorgis, Marie-Pierre
Bischof, Daniela F.
Marreros, Nelson
Willisch, Christian
Signer, Claudio
Filli, Flurin
Brosi, Georg
Frei, Joachim
Vieli, Edy M.
Published in : Veterinary microbiology
Volume(Issue) : 134
Issue : 3-4
Pages : 368
Pages to: 374
Publisher / Ed. Institution : Elsevier
Issue Date: 2009
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
Language : English
Subject (DDC) : 571: Physiology and related subjects
590: Animals (Zoology)
Abstract: Mycoplasma conjunctivae is considered the major cause of infectious keratoconjunctivitis (IKC) in Alpine ibex (Capra i. ibex) and chamois (Rupicapra r. rupicapra). While it is known that domestic sheep can act as healthy carriers for M. conjunctivae, this question has not been addressed in wild ungulates so far. In this study, bacteriological investigations and field observations were performed to assess whether free-ranging Alpine ibex can be healthy carriers of M. conjunctivae. Among 136 ibex without clinical signs of IKC, M. conjunctivae was identified 26 times (19.1%) by TaqMan PCR. To assess the potential pathogenicity of M. conjunctivae strains isolated from asymptomatic eyes, strains from three healthy ibex and from 15 IKC-ibex and IKC-chamois were analysed genetically by DNA sequence analysis of the variable part of the lppS gene. No significant differences were observed between strains from asymptomatic and clinically affected animals, reflecting the assumption that healthy ibex may act as carriers for M. conjunctivae strains that may be pathogenic for other individuals. Our results further indicate that development of IKC is associated with M. conjunctivae load in the eyes. In addition, a questionnaire survey revealed that IKC is generally less common in ibex than chamois and that infection in wild ungulates is not necessarily linked to the presence of sheep. These data support the hypothesis that apparently healthy ibex may be important in the epizootiology of IKC and indicate that host predilection may play a role in IKC development.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific journal
DOI : 10.1016/j.vetmic.2008.08.005
ISSN: 0378-1135
1873-2542
URI: https://digitalcollection.zhaw.ch/handle/11475/15477
Appears in Collections:Publikationen Life Sciences und Facility Management

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