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In the paper are presented entomopathogenic nematodes (EPN) as a vector of bacteria killing insects. Many abiotic and biotic factors influence the survival and the virulence of mentioned organisms. These biological agents of control are used in practice over twenty years. Knowledge about the relationships between EPN-insect-bacteria allow to increase efficacy of treatment used in order to limiting populations of pests. The paper presents a short review of literature data of titled subjects.

Relations of particular genera of Monocercomonadidae and Trichomonadidae with groups of hosts are discussed. Main hosts of these flagellates are insects (mainly termites) and cold-blooded vertebrates (amphibians and reptiles); the proper location within the host body is the intestine. Some representatives of these flagellates have changed their host and location and occur now in warm-blooded vertebrates (birds and mammals) and in man, usually in organs other than the intestine. Change of localization within the host body is probably responsible for growing pathogenicity of these flagellates.