This diploma thesis aims to compare Czech and Bulgarian Biology textbooks for primary and secondary schools with a special focus on parasitic organisms. The goal was to determine the differences in the processing of textbooks and whether the topic of parasitology is comprehended fundamentally different. The evaluation was performed as a qualitative analysis as the textbooks were scored according to pre-set criteria. Furthermore, in the quantitative part of the research, the occurrence of individual parasites in the examined textbooks was monitored. The analysis also focused on the comparison of educational systems and educational programs taking parasitic organisms into consideration. In my work, I came to the conclusion that both regions h...