The proposed article presents the results of a study of the effectiveness of the application of the biological preparation «Bacticide» to combat blood-sucking insects. The relevance of the topic is due to the enzooticity of a significant part of the territory of the Republic of Kazakhstan for various natural-focal diseases. The carriers of many diseases are blood-sucking arthropods, which provide circulation of pathogens in nature and serve as their reservoirs and long-term custodians. The study of ecologo-epizootological features of vectors of medical significance in various infectious diseases is an important part of the work in the complex of antiepidemic measures.