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Roberto Rolando Pisano, Simone; Steiner, Jonas; Cristina, Elodie; Delefortrie, Zoé; Delalay, Gary; Krieg, Raphael; Zenker, Armin; Schmidt-Posthaus, Heike
Journal of invertebrate pathology, 09/2024, Letnik: 206Journal Article
Display omitted •First presentation of the spatiotemporal distribution of crayfish plague cases in Switzerland.•54 confirmed crayfish plague cases between 1980 and 2020.•Earliest detection of A. astaci DNA through qPCR in a sample of 1991.•Re-evaluation of archived samples increased the positive rate by 16.3%. The oomycete Aphanomyces astaci is the causative agent of crayfish plague, a disease threatening susceptible freshwater crayfish species in Europe. To detect its spatiotemporal occurrence in Switzerland, we reviewed (1) the literature regarding occurrence of crayfish plague and North American crayfish carrier species and (2) the necropsy report archive of the Institute for Fish and Wildlife Health (FIWI) from 1968 to 2020. In the past, crayfish plague was diagnosed through several methods: conventional PCR, culture, and histology. When available, we re-evaluated archived Bouin’s or formalin-fixed, paraffin-embedded samples collected during necropsies (1991–2020) with a recently published quantitative PCR. Literature research revealed putative reports of crayfish plague in Switzerland between the 1870s and 1910s and the first occurrence of three North American crayfish species between the late 1970s and 1990s. Finally, 54 (28.1%) cases were classified as positive and 9 (4.7%) cases as suspicious. The total number of positive cases increased by 14 (14.7%) after re-evaluation of samples. The earliest diagnosis of crayfish plague was performed in 1980 and the earliest biomolecular confirmation of A. astaci DNA dated 1991. Between 1980–1990, 1991–2000 and 2001–2010 crayfish plague spread from one to two and finally three catchment basins, respectively. Similar to other European countries, crayfish plague has occurred in Switzerland in two waves: the first at the end of the 19th and the second at the end of the 20th century in association with the first occurrence of North American crayfish species. The spread from one catchment basin to another suggests a human-mediated pathogen dispersal.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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