PREVALENCE OF ECHINOCOCCOSIS IN PIGS AND SHEEP IN THE SLOVAK REPUBLIC

The prevalence of echinococcosis in slaughtered animals has been monit ored in the Slovak Republic between 1971 and 1990. In pigs, the preval ence dropped almost constantly from 3.85% to 0. 1 3%, by as much as 15 % per year. The dynamics of prevalence in sheep differs substantially from that in pigs. Significant 12 year, 6 year and 3 year periodicitie s predominate over a nonsignificant and slight decrease of prevalence by only 1% per year. Therefore, the prevalence fluctuates in the perio d of observations between 0.49 and 3.72%. No significant correlations or cross-correlations have been found between the prevalences in the t wo groups of animals.