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Fauna and epidemiological value of ticks (acari, ixodidae) in the passerine birds of the Republic of Moldova

Author: Morozov Alexandr
Degree:doctor of biology
Speciality: 03.00.19 - Parasitology, helminthology
Scientific adviser: Alexandru Movilă
doctor, associate professor (docent)
Scientific consultant: Ion Toderaş
doctor habilitat, professor, Institute of Zoology
Institution: Institute of Zoology


The thesis was presented on the 15 December, 2022
Approved by NCAA on the 24 February, 2023


Adobe PDF document0.92 Mb / in russian
Adobe PDF document0.95 Mb / in romanian


CZU 595.421(478) (043.3)

Adobe PDF document 3.77 Mb / in romanian
161 pages


ixodid ticks, birds, tick pathogens, epizootological and epidemic significance


Structure of the work: introduction, five chapters, main conclusions and recommendations, bibliography from 307 sources. The work is presented on 111 pages of the main text, contains 16 tables and 28 figures. The results are published in 17 scientific papers.

Research Area: parasitology

The purpose of research: to study the species diversity of ixodid ticks collected from passerines, to identify their potential epidemiological significance and potential role as reservoirs of human and animal infections.

To achieve this goal, the following research tasks were identified: To determine the species composition of ixodid ticks parasitizing on the passerine birds in the Republic of Moldova, to find out the seasonal dynamics of the occurrence of ticks on birds in different periods of the year. To determine the species composition of birds, which are the main hosts of the ixodid ticks on the territory of the Republic of Moldova, to identify the factors that determine this species composition. To identify which pathogenic agents are transfered by collected ixodid ticks using modern methods in molecular biology. To analyze the potential epidemiological significance of ticks collected from birds.

Scientific novelty and originality of research. For the first time the real-time PCR, method was used to study tick pathogens in the Republic of Moldova. The level of infestation of ticks collected from birds with borrelia, rickettsia, anaplasmas and babesia pathogenic for humans has been determined. For the first time the presence of human pathogen Borrelia, miyamotoi was detected in Ixodes ricinus ticks in the Republic of Moldova, which is the causative agent of recurrent fever.

The results obtained that contribute to solving the important scientific problemare the scientific substantiation of the role of ixodid ticks (Acarina: Ixodidae) collected from birds and in particular the preimaginal stages of Ixodes ricinus tick as carrier of various tick-borne pathogens. These results led to the identification of the species composition of birds, which are the hosts of ixodid ticks and the potential role of birds as reservoirs of infections. This allowed for the first time in the last 40 years to obtain reliable data on the role of birds in the spread and maintenance of tick pathogens causing human diseases. The data obtained contribute to the prediction of the epidemiological situation in the Republic of Moldova.

Theoretical significance. The obtained results expand knowledge about the fauna and ecology of ixodid ticks, as well as the epizootological and epidemiological role of birds and ixodid ticks in the Republic of Moldova.

Practical significance. The dissertation materials can be used in scientific and practical work of epidemiologists, entomologists, microbiologists, as well as didactic material on parasitology, zoology and ecology of animals. The data obtained are of interest to the Public Health Centers as contributing to the predictions of the epidemiological situation and drawing up plans for monitoring and controlling the number of ixodid ticks.

Implementation of the results: the results of this work are used in lectures of the State University of Moldova, the Faculty of Biology and Soil Science, as well as in the work of the MedExpert Medical Analysis Center in the molecular biology laboratory when testing ixodid ticks