title: [The landscape-biocenological concept of a combination of natural foci of diseases. Environmental conditions predetermining the formation of biotic and epizootic bases for a combination of natural foci of diseases].
abstract: The potential of a combination of foci of diseases is not limited by environmental conditions. The biotic and epizootic bases for the combination of foci are formed under the influence of the environmental factors predetermining the formation of the bases for the combination of the foci. These are pathogen populations, parasitic systems of foci with forming parasitocenoses, the functional and spatial pattern of the foci, susceptibility of hosts (vectors), polyhostality of pathogens and mechanisms of their transmission. The author places emphasis on the fact that any single factor cannot serve as a basis for the combination of the foci since the combination bases form only when pairs of identical factors interact. He points to the interrelation and correlation of the considered bases for the combination of the foci. The combination of invasion foci is noted to be effected in the absence of mixed infectiousness of specimens. The coacting parasitic systems of foci are predetermined to manifest themselves as the underlying biotic bases that determines the type of the combination of foci. The level of the combination of parasitic systems of the foci is predetermined by the parasitocenoses of coacting populations of pathogens and hosts (parasitic systems). The interacting functional and spatial patterns of the foci predetermine the latter's community, by acting as biotic bases for the combination. The susceptibility of hosts (vectors) and the polyhostality predetermine a range of interacting parasitic systems. The polymorphism of the types of hosts determines the functional strength of parasitic systems, by predetermining the stability of a combination of foci. The interacting identical mechanisms of transmission act as an epizootic basis for the combination of the foci. The continuity of the biotic and epizootic bases for the combination of the foci is stated.
authors.forename: A V
authors.initials: AV
authors.lastname: Ushakov
mesh_terms: D000818:Animals; D004197:Disease Reservoirs / Q000382:microbiology / Q000469:parasitology / Q000662:veterinary; D004199:Disease Vectors; D017753:Ecosystem; D006790:Host-Parasite Interactions; D006801:Humans; D010273:Parasitic Diseases, Animal / Q000382:microbiology; D011157:Population Dynamics