Current state of an isolated focus of alveolar echinococcosis on the territory of Bering island of the Сommander-aleutian island arc

In the period 2016-2022, 351 fecal samples of the Bering Arctic fox were studied (winter season - 96 samples, summer - 173, spring - 82) and 11 intestinal samples using the method of incomplete helminthological dissections, as well as 104 specimens of red-backed vole liver (24 specimens were caught in the autumn). winter period, 80 - in summer). The infestation of the Arctic fox with E. multilocularis, according to the results of fecal ovoscopy, ranges from 20-21% in the spring-winter to 1.3% in the summer, according to the results of the autopsy - 18.2%, with very low rates of invasion intensity. Infection of voles with E. multilocularis larvocysts 14.4%. Bering Island can be considered endemic for E. multilocularis, where the natural island focus of the pathogen operates stably.

1. Kimura M., Acira T., Yajime T., Seiko T. Echinococcus multilocularis delected in slaithered pigs in Aomori the Northenmost Prefecture of Mainland Japan // Jap. J. Inf. Dis. - 2010. – v. 63. - P. 80-81.

2. NorishigeY., Yasuyki M., Koon M., Yamaguchi M. The reported case of dog infected witch E. multilocularis in Saitame Prefecture, Japan // Labor. and Epid. Comm. - 2006. - v. 29. - P. 351-352.

3. Takao I., Kyoji Y., Yasuyuki M., Kinpei Y. High probability of pet dogs encountering the sylvatic cycle of Echinococcus multilocularis in a rural area in Hokkaido, Japan // J. Vet. Med. Sci. - 2019 Nov; 81(11). - P. 1606–1608.

4. Giraudoux E., Raoul F., Pleydell d. Drivers of E. multilocularis transmission in China: small mammal diversity, landscape or climate // Neglected Trop.Dis. - 2013. – v. 7.- P. 133-134.

5. Massolo A., Liccioli S., Budke c., Klein C. Echinococcus multilocularis in North America: the great unknown // Parasite – 2014. – v. 21, № 73. - P. 1-13.

6. Peregrine A.S., Kotwa J. E. multilocularis: an emergyng treat to canine and human health in Canada // Can.Vet. - 4-6. - 2016. - P. 14-16.

7. Nakao M., Xiao N., Okamoto M. et.all. Geographic pattern of genetic variation in the fox tapeworm Echinococcus multilocularis // Parasitology Int. - 2009. – v. 58(4). – P. 384-389.

8. Vuitton D.A., Zhou H., Bresson-Hadni S., Wang J. e.a. Epidemiology of alveolar echinococcosis with particular reference of China and Europe // Parasitology, 2003. – v. 127. – P. 87-107.

9. Kovalenko F., Darchenkova N., Legonkov Y., Musaev G., Gudovsky L., Parshin V. Hydatid diseases (cystic and alveolar) in Russia (1983-1997) // Acta Parasitol. 2000; 45: 241-242.

10. Konjaev S.V., Yanagida T., Nakao M. et.all. Molecular identification of human echinococcosis in the Altai region of Russia // Parasitology Int. - 2012. - v. 6(14). - P. 711-714.

11. Konjaev S.V., Yanagida T., Nakao M. et.all. Genetic diversity of Echinococcus spp. in Russia // Parasitology - 2013. - v. 140. – P. 1637-1647.

12. Коняев С. В., Янагида Т., Кривопалов А. В., Дупал Т. А., Абрамов С. А., Накао М., Сако Я., Гуляев В. Д., Ито А. Генотипическая характеристика возбудителя альвеолярного эхинококкоза (Echinococcus multilocularis) в Западной Сибири // Актуальные вопросы ветеринарной биологии. - 2012. № 3(15). – С. 61-66.

13. Barth T.E., Casulli A. Morphological characteristics of alveolar and cystic echinococcosis // Pathogens - 2021. - 10(10). – P. 13-26.

14. Davydova O.E., Shienok A.N., Tynyo A.Ya. On the species composition of territorial helminth faunal complexes of the Bering Arctic fox on the Commander Islands // Sovrem. Aspects of theriological research: problems and prospects: Materials of scientific and practical conference, dedicated. in memory of P.G. Kozlo. – Minsk, 2017. – P. 32-37. in Russian.

15. Davydova O.E., Shienok A.N., Kunitsa A.A. Alveolar echinococcosis of animals in the conditions of Bering Island, Commander-Aleutian island arc // Collection of scientific works of the international educational method. and scientific.practical conference.., dedicated. 140th anniversary of the birth of Academician K.I. Scriabin. – November 15-16, 2018. – M., MGAVMiB, 2018. – P.120-126. - in Russian.

16. Davydova O.E., Shienok A.N., Mamaev E.G. Distribution of loimologically significant natural focal helminth infections of the Arctic fox on the territory of Bering Island, Komandorsky Natural Biosphere Reserve // Modern problems of general and special parasitology: Materials of the III International Parasitological Symposium, St. Petersburg, December 18-21. 2019 – St. Petersburg, 2019. – P.98-102. - in Russian.

17. Davydova O.E., Shienok A.N. Distribution of Echinococcus multilocularis and Trichinella nativa in animals in the Komandorsky Nature Reserve // Modern problems of general and applied parasitology: Proceedings of the XIII scientific-editing conference in memory of prof. V.A.Romashova. - Voronezh, 2019. - P. 17-23. - in Russian.

18. Davydova O.E., Izotova E.S., Sorokin P.A. Alveolar echinococcosis of animals in the conditions of the Bering Island of the Komandorsky Natural Biosphere Reserve // Collection of scientific works of the X All-Russian Interuniversity Conf. in clinical veterinary medicine. - M. 2020. - pp. 389-398. - in Russian.

19. Davydova O.E., Shienok A.N., Sergienko V.V. Red vole (Myodes rutilus) as an intermediate host of pathogens of natural focal cestodoses of the relict Arctic fox on the territory of Bering Island // Mammals in a changing world: current problems of theriology - Materials of the XI Congress of the Theriological Society of the Russian Academy of Sciences. - M., 2022. – P. 423. - in Russian.

20. Vasilevich F.I., Davydova O.E. Esaulova N.V., Tsepilova I.I., Shemyakova S.A. Helminthocoprological and sanitary-parasitological studies in veterinary medicine. – M., 2022. - pp. 19-20.- in Russian.