Dr. Holló Ferenc szerk.: Parasitologia Hungarica 3. (Budapest, 1970)

groups under 30 years. Bearing in mind the dynamics of the infection, this means no more than a somewhat earlier acquisition of the infection by males than by females.The line representing male EST reactors would be fairly irregular if the data were considered on the basis of decimal age groups. The curve in Fig. 2. was drawn in view of possible deviation.The discrepancy between the actual mean values and . the constructed curve is a matter of course as each decimal age group can be regarded as an independent population. It is rather the close agreement of the constructed line with data representing females that is noteworthy. Because toxoplasmosis is an anthropozoonosis the tracing of „closer" contact with animals in the past and present was considered essential

.The term „closer" contact denotes the keeping of animals. As the information obtained seemed reliable only with adults (between 20 to 60 years) only data on the latter groups are presented. The occurrence of contact with animals among reactors and non-reactors to the FST is shown in Table 5« The difference in contact with animals between reactors and o non-reactors proved significant (x = 4,03; p^ 0,05) in the case of Budapest inhabitants. No appreciable difference concerning the species of animals contacted was found between the two groups. Discussion Is must be observed by way of introduction that our survey enables us to discuss merely the epidemiology of the infection and not that of the disease produced by toxoplasma. (Analysis of human pathogenicity of post-natally acquired T. gondii infection is beyond our present aim. Human T. gondii infection is regarded as a condition of symbiosis by such outstanding parasitologists as e.g. WESTPHAL and BAUER (1952). Others class toxoplasmas as facultative parasites. On account of the striking