The duration of rest and feeding greatly affects the re-breeding of ectoparasites: Hirudo verbana, Hirudo medicinalis and Hirudo orientalis.

Ectoparasitic leeches have many biologically active substances in their body, which are able to show various therapeutic effects, which makes them very relevant in the study. Among them, the most common are medicinal leeches: Hirudo verbana, Hirudo medicinalis and Hirudo orientalis. They are listed in the Red Book as a vulnerable species, so their population is mostly supported in biolabs.

The influence of the planting time and conditions on the reproductive properties of Hirudo verbana and Hirudo medicinalis.

Factors that affect on the sexual behavior of leeches not only in nature, but also in artificial conditions remain largely unexplored. We did not find data on the behavior of medicinal leeches, which are not placed in time from the aquatic environment in the peat-soil conditions after the appearance of clitella on their bodies. Therefore, the study of this problem has become relevant.

Morphological parameters of spleen and thymus of the male rats on the basis of the hirudological influence of Hirudo verbana.

The aim of this work is to study the morphological parameters of the spleen and thymus of rats along with hirudological influence from Hirudo verbana. The work was carried out on 40 male outbred laboratory rats weighing 280-300 grams, age 6.5-7 months.

Indirect effect of substances of the hemophagous parasite Hirudo verbana on the immune system of the host rats.

A positive relationship between the hematophagous parasite-medicinal leech and the host (animals and humans) has been partially shown by many authors. But only direct influence was shown, and how they can influence indirectly has not been studied by anyone. Therefore, it became relevant to analyse the immunological parameters of blood and histological analysis of the central lymphoid organ of female rats on the 30th day after the birth of their offspring, as well as the same indicators in their offspring on the 30th and 60th days of ontogenesis under the indirect influence of saliva substances of the hematophagous parasite Hirudo verbana.