Hymenolepis nana

The prevalence data concerning hymenolepiasis are available only for Estonia and Lithuania, while for Latvia the data available were presented in the form of registered case reports. The situation with hymenolepiasis in Estonia and Lithuania has been more or less similar, the infection having a focal character mostly devoted to children's homes, kindergartens, and children up to

9 years of age (Taunene 1962; Kondratjeva et al. 1963; Jogiste and Barotov 1993). Thanks to its focal character the prevalence of this infection has mostly been lower than 0.1%, and only single cases per year are reported nowadays. Historically, the highest number of cases has been reported for Estonia with more than 300 cases per year in 1958 and 1959. In Latvia, the numbers were 53 (in 1959 and 1960) and in Lithuania, there were between 70 and 90 cases per year between 1958 and 1960. Since 1973, less than

10 cases per year have been registered in Latvia except 1986, when 13 cases were reported. From 1986, five cases have been reported in Latvia: four cases in 1989 and one case in 1995. In Lithuania, 10 or less cases yearly have been reported since 1984. In Estonia, the number of reported cases decreased below 100 by 1964 and to 25 or less by 1972. In the end of the 1980s and the beginning of the 1990s, there was a permanent focus in one children's home in Estonia, which is now eliminated. In 1995, only one case was reported in Estonia.

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