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Introduction: The infection caused by Borrelia burgdorferi initiates a number of reactions in the human immunological system and particular behaviors of the infectious factor. The aim of work was to analyze the level of circulating immune complexes (CIC) due to infection with Borrelia burgdorferi in persons professionally exposed to tick bites., Material and Methods: The group of tested consisted of 275 persons, who are professionally exposed to tick bites, including 171 foresters and 104agriculturists. The controlled group consisted of 45 people, living permanently ortemporarily in Biata Podlaska, city in the South Podlasie Lowland, who have not been exposed professionally on tick bites.The screening test ELISA (Euroimmun) has been carried among all persons from the tested group towards the presence ofantibodies IgM/IgG anty-Borrelia. Among those who met positive or delimited results from screening test Elisa, another test of Western blot (Wb, Euroimmun, Virotech GmbH) has been carried in order to confirm the infection. The serum which has been taken from a group of persons being professionally exposed to infection of B. burgdorferi and persons from a controlled group, has been tested in terms of estimating levels of circulating immune complexes CIC C1q (Elisa, DRG)., Results and Conclusion: The circulating immune complexes (CIC) are increasingly generated at persons with present IgM and/or IgG anty-Borrelia but their existence accompanied by the presence of strongly expressed humoral response does not affect the diagnostic effectiveness of infections with B. burgdorferi.