Prevalence of the pathatus Cryptosporidium parvum in syananthropic biocenoses

Abstract

The purpose of the research is to determine the relationship between the infestation of Cryptosporidium parvum in calves that have regular contact with synanthropic reservoirs (rodents and birds) in the climatic zones of Udmurtia. The study of the distribution and relationship of manifestations of cryptosporidiosis was carried out among calves that have regular contact with synanthropic rodents (gray rat (Rattus norvegicus), house mouse (Mus musculus), common vole (Microtus arvalis), bank vole (Myodes glareolus)) and birds (rock dove). (Columba livia), house sparrow (Passer domesticus), jackdaw (Coloeus monedula)). In total, 255 calves, 160 rodents and 80 birds were subjected to the study.The assessment of infestation of calves, rodents and birds was carried out by generally accepted coprological flotation methods, as well as by making native smears with further Ziehl-Neelsen staining. The results obtained were evaluated using statistical methods: analysis of variance, taking into account the Fisher criterion and the Pearson correlation coefficient.The results of the research showed that in all natural and climatic zones of the Udmurt Republic a high percentage of infection with cryptosporidiosis of calves is recorded.On the territory of the southern zone, the infection rate of calves with cryptosporidiosis was 62.35%, while in captured mouselike rodents the prevalence of invasion was at the level of 37.25%, and in birds - 20.0%.In the farms located on the territory of the northern natural and climatic zone of the republic, the degree of infestation of calves reached 41.18%, the infection of rodents was 23.91%. The minimum percentage of detection of cryptosporidium oocysts among synanthropic birds was observed in the north of Udmurtia - 11.77%.The fact of the dependence of the invasion by the causative agent of cryptosporidiosis of calves on the presence of parasite carriers in farms has been established. According to the results of calculating the correlation coefficient and analysis of variance, a direct close relationship was revealed between the infection of calves and representatives of the synanthropic reservoir - rodents, birds, regularly in contact with agricultural crops. animals.