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Toxoplasmosis is globally distributed, water- and food borne zoonosis caused by the single protozoan Toxoplasma gondii and probably one-third of the world’s human population is infected with this pathogen. Domestic and wild felids are definitive hosts of this pathogen and intermediate hosts for great variety of other homoeothermic animals. Human as other of the intermediate hosts may become infected in the main route of infection; it is the ingestion of parasite oocysts in contaminated water or soil and undercooked meat. However, the mechanism which this parasite uses to so large spread is not fully understood, because oral transmission does not explain the common event of this parasite in a variety of hosts, such as herbivorous animals or rodents and birds, as well as routes of spread to domestic hosts. Such a wide circle of hosts suggests a possibility of other paths of transmission and a role of ticks, the bloodseeking arthropods was considered in the transmission of T. gondii.
Attempts were made to identify the causative orgamsm of Lyme disease in Szczecin from tick Ixodes ricinus as a vector. Ticks were collected in 1997 year in forest areas of Szczecin, from localites associated with numerous attendance of people. The method used in this study was the polymerase chain reaction (PCR) on the flagellin structural gene fla of Borrelia burgdorferi sensu stricto. The flagellin PCR primer set reaction was conservative for B. burgdorferi sensu stricto, B. afzelii and B. garinii. The overall prevalence of B. burgdorferi sensu lato, in tick population studied was 8.8%. The female, nymphs and larves of Ixodes ricinus were infected almost just the some - about 10%, when the male 2.5% only.
Composition of the bacterial flora accompanying Balantidium coli in the rectum content of pigs affected by acute (Group 1) and symptom-free (Group 2) balantidiosis was studied. The course of balantidiosis was found to be dependent on composition of the bacterial flora. B. coli virulence towards the host’s tissues may be a secondary effect of the changes in biological, chemical, and physical conditions of the parasite’s biotope.
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