The Russian North is the zone of the widest distribution of T. saginata infection, in Russian literature -teniarinchosis. The prevalence of infection in the Vyatka region was up to 5% in 1943-1945, but decreased to 0.4% in 1957. The mean prevalence of infection was 0.34% in JNAD in 1965 and 0.53% in 1973 (Bessonov 1988). It was experimentally proved that Cysticercus bovis from the North reindeer (Cervidae) is not infective for cattle and vice versa - C. bovis from cattle (the southern isolates) are unable to reproduce in reindeers. Cysticercosis of the North isolate have been found located in the brain of reindeers (Kirichek et al. 1984). The raw brain of the North reindeer is the main source of infection for the aboriginals of the Yamal peninsula. The Mountain-Altai Autonomous District was the most intensive focus of taeniasis due to T. saginata in the West Siberia. The prevalence was up to 43.6% in 1929. It was 5.7% in the whole Altai region in 1929, but only 0.024% in 1974. The prevalence of infection in the Irkutsk region was 1.9% in 1959 and 1.5% in 1963. The disease is more prevalent in Buryatia (part of the Irkutsk region) where it reached up to 5.9% in 1959, but decreased to 0.1% in 1973. The prevalence of the infection in Yakutia was up to 40% in 1925 and it ranged from 1.8 to 15.2% in 1951-1970. The same figure for Sakhalin was 0.02% in 1980 (Bessonov 1988).
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