The effects of immunisation with Chlamydia psittaci-Gocaltovo strain were examined on the dynamic alterations in lymphocytes T and B and in their subpopulations in the peripheral blood of rabbits; the titer of specific anti-Chlamydia antibodies was also established. The results showed that the examined strain induced alterations in the form of an increased or decreased number of T and/or B lymphocytes and in their subpopulations, and that immunity conditioned by the cells proved to be a very significant variable in infection with Chlamydia psittaci (at present Chlamydophila abortus). Alterations in the immune pattern developed earlier by 35 days as compared to positive titers of specific antibodies.
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