Taeniosis has been registered in Lithuania from 1949 till 1970 as a single infection for both T. solium and T. saginatus. In 1949, 0.9% of the people tested were infected with taeniosis in Lithuania, and by 1959 it decreased to 0.6%. In the same year in Estonia, the prevalence was 0.015% for T. solium and 0.006% for T. saginatus. These numbers have been decreasing in all three countries and in 1990s there have been single cases registered in some years. The decrease can be followed also for the prevalence of cysticerci in cattle and pigs. In 1964 in
Lithuania, 1083 cases or 0.19% prevalence was registered in slaughtered cattle and 183 cases or 0.02% prevalence in pigs. By 1982, 152 cases were documented in cattle (0.02%) and one case in pigs. Beginning from 1986, only two cases of T. solium infection have been registered, and this was in 1993 in Estonia, while the veterinary control did not identify any infected pigs ( Jogiste and Barotov 1993). The prevalence of T. saginatus in cattle has been higher, but that too is declining. During the 1970s, veterinary control found 868 infected animals, while in the 1980s the number was 303; of them 230 between 1980 and 1984, and 73 from 1985 to 1989. This situation is reflected in the cases of human infection as well: one to five cases being registered yearly since 1980.
The improvement in the situation with taeniosis infections in all three countries could be attributed to the changes in cattle and pig farming throughout the Soviet period: concentration of animals had taken place in big farms, or so called factories in the case of pigs, enabling more efficient veterinary control. After the breakdown of the collective farm system, cattle breeding is decentralizing, and an increase in the prevalence of taeniosis can be anticipated as has happened with trichinellosis, if the veterinary control measures are not adapted to the new situation.
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