Phase stages and circle structure of epizootic circulation of erysipelas of swine in the conditions of southern Prychernomorye steppe zone
AbstractErysipelas agent of swine is a typical bacterial agent of sapronosis nature which has successfully formed and steadily supports polyhostal antropurgic epicenters of mixed (naturally – synantropic) and farming type. Taking into consideration significant differences in the genesis, ethiology and structure of all these epicentres, realities of their arrangement, activity and specificity of functioning permanently come into contradiction concerning commonly known principles and regularity which are characteristic to most naturally epicentric zoonoses. The aim of our researches was to determine primary ecologically epizootic reasons that provide phase and stage changes of erysipelas local epicenters of activity (of antropurgic type). The main materials for analytical general conclusions that have been carried out were accumulated during the research of erysipelas epicenters of different ecotypes in 2009–2015. All factual data were subjected to standard statistical analysis with the help of software programme methods of «Statistica» block in the «Exel-2012» system. The generalized analysis results of density dynamics data of field rodents (without their species detailization) and the results of their bacteriological control deny the existence of the direct dependence in the system «rodents’ number – infection activity» showing more complicated (multifactorial) essence of natural regularity of spontaneous epizootic process of this infection. The enzooticity of intrazonal territories of flooded areas and river overflow lands where natural circles of erysipelas circulation is supported by the unified complex of natural ground conditions and narrow hostile reservoir – community of warm blooded hosts with ecologically, statially and etologically similar characteristics has been established. It has been found out that the main hosts field strains E.insidiosa can be considered to be a grey field mouse (without taxonomic detailization) and exantropic domestic mice. The largest amount of agent occurrences took place in autumn at a time when the number of the population is the highest (with the high level of the young). In spring the amounts of rodents’ population increase and the isolation amounts of the cultures E.insidiosa from them are noticeably less which is perhaps stipulated by the death of the ultimate mass of carriers in the winter period.
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