Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Retrospective analysis of the composition of Eimeria field isolates and the dynamics of their sensitivity to the commonly used coccidiostatics in 2016-2019.

Abstract

A retrospective analysis of the biodiversity of field strains of Eimerias isolated from 22 Russian poultry farms in 2016-2019 and dynamics of their adaptation to the commonly used coccidiostatics was performed. The eimeriostatic activity of the drugs was studied by the infection of 14-day chicks with isolated field strains. The analysis of the biodiversity of the field strains evidenced that between 2016 and 2019 the incidence of single species invasions decreased while the occurrences of the mixed invasions by 2 or 3 species increased; these combined invasions evidently contributed to the rate of the resistibility to coccidiostatics. All studied field strains featured certain degree of tolerance toward common coccidiostatics though after 2019 the trend to lower adaptation of the Eimerias to certain drugs was registered. Our results evidenced the presence of the adaptation to certain classes of the coccidiostatics and multi-drug resistibility to the drugs from different classes. These findings are in agree with the worldwide trend of the increased multi-drug resistibility of the Eimerias to the coccidiostatics.