The importance of measuring the impact of the hydatidosis control program activities on the health of human populations has been emphasized. The different rates used, as well as their limitations defining new hydatidosis cases, are described. The specific incidence rates for the age group of 0-10 years should be considered, together with the standardization of serologic and echographic screening in young groups, in order to achieve the epidemiological evaluation of the control programs impact on a human population in the short term.