The emergence of epitheliocystis in the upper Rhone region: evidence for Chlamydiae in wild and farm salmonid populations

Guevara Soto, Maricruz; Vidondo Curras, Beatriz; Vaughan, Lloyd; Seth-Smith, Helena; Nufer, Lisbeth; Segner, Helmut; Rubin, Jean-Francois; Schmidt-Posthaus, Heike (2016). The emergence of epitheliocystis in the upper Rhone region: evidence for Chlamydiae in wild and farm salmonid populations. Archives of microbiology, 198(4), pp. 315-324. Springer 10.1007/s00203-016-1192-x

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We present the first study comparing epitheliocystis in a wild and farmed salmonid in Europe. Sampling three tributaries to the Lake Geneva, including one from headwaters to river mouth, revealed an unequal distribution of epitheliocystis in brown trout (Salmo trutta). When evaluated histologically and comparing sites grouped as wild versus farm, the probability of finding infected trout is higher on farms. In contrast, the infection intensities, as estimated by the number of cysts per gill arch, were higher on average and showed maximum values in the wild trout. Sequence analysis showed the most common epitheliocystis agents were Candidatus Piscichlamydia salmonis, all clustering into a single clade, whereas Candidatus Clavichlamydia salmonicola sequences cluster in two closely related sub-species, of which one was mostly found in farmed fish and the other exclusively in wild brown trout, indicating that farms are unlikely to be the source of infections in wild trout. A detailed morphological analysis of cysts using transmission electron microscopy revealed unique features illustrating the wide divergence existing between Ca. P. salmonis and Ca. C. salmonicola within the phylum Chlamydiae

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Veterinary Public Health Institute
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP)
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Center for Fish and Wildlife Health (FIWI)

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Guevara Soto, Maricruz; Vidondo Curras, Beatriz; Segner, Helmut and Schmidt-Posthaus, Heike

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 590 Animals (Zoology)

ISSN:

0302-8933

Publisher:

Springer

Language:

English

Submitter:

Heike Schmidt Posthaus

Date Deposited:

31 Mar 2016 10:03

Last Modified:

08 Mar 2018 13:39

Publisher DOI:

10.1007/s00203-016-1192-x

PubMed ID:

26802008

Uncontrolled Keywords:

Brown trout; Candidatus Clavichlamydia salmonicola; Candidatus Piscichlamydia salmonis; Farm; River

BORIS DOI:

10.7892/boris.78412

URI:

https://boris.unibe.ch/id/eprint/78412

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