One of the most extensive natural plague centers, or foci, is located in Central Asia, in particular, the Zhambyl region in Southern Kazakhstan. Here, we conducted plague surveillance from 2000 to 2020 in the Zhambyl region in Kazakhstan and confirmed 3,072 cases of infected wild animals. We used Species Distribution Modeling by employing MaxEnt, and identified that the natural plague foci are primarily located in the Moiynqum, Betpaqdala, and Tauqum Deserts. The Zhambyl region's central part, including the Moiynqum and Sarysu districts, has a high potential risk of plague outbreak for the rural towns and villages. Since the phenomenon of climate change has been identified as a determinant that affects the rodent populations, thereby elevating the likelihood of an outbreak of plague, we investigated the potential dissemination routes of the disease under the changing climate conditions, thus creating Species Distribution Forecasts for the rodent species in southern part of Kazakhstan for the year 2100. By 2100, in case of increasing temperatures, the range of host species is likely to expand, leading to a higher risk of plague outbreaks. The highest risk of disease transmission can be expected at the outer limits of the modeled total distribution range, where infection rates are high, but antibody presence is low, making many species susceptible to the pathogen. To mitigate the risk of a potential plague outbreak, it is necessary to implement appropriate sanitary‐epidemiological measures and climate mitigation policies.

The aim of the study was to improve epizootiological monitoring and increase the effectiveness of preventive (anti-epidemic) measures for camel plague control in Kazakhstan.Materials and methods. We used the data on epizootiological and epidemiological monitoring in natural plague foci of Kazakhstan, long-term measurements and indicators for the period of 2000–2020 of the anti-plague and veterinary services of the Republic for the analysis. To process the evidence, epidemiological, epizootiological, microbiological, and statistical research methods, as well as GIS technology were applied.Results and discussion. The number of camels has increased by 2.2 times in Kazakhstan over the past 20 years. Where there were 98.2 thousand heads in 2000, it amounted to 216.4 thousand heads in 2020. Over the past 10 years, 152 camels died of unknown causes in the focal area of the country, but laboratory tests for plague turned out negative. According to the hazard criteria, the territory of the country has been conditionally divided into three zones: five regions with a high degree of hazard with a total area of 953.15 sq. km, five regions with medium degree of hazard with a total area of 1230.72 sq. km, and with a low degree of hazard – four regions and three cities of republican significance with a total area of 541.1 sq. km. Constant epizootiological monitoring over plague in camels is a necessity for the system of preventive measures.

This study explores the application of long-read sequencing technologies for genotyping, epigenetic profiling, and epidemiological monitoring of Yersinia pestis isolates obtained from natural foci in Central Asia and previous zoonotic outbreaks. Computational tools for genome assembly and genotyping were developed, enabling high-precision identification of both chromosomal and plasmid sequences, including the small cryptic pCKF plasmid. SNP-based genotyping distinguished the major Y. pestis biovars (Antiqua, Medievalis and non-main) and revealed cluster-specific diversity among Medievalis (MED) isolates, identifying a group of strains particularly prone to transmission from rodents to domestic animals and humans, which can be facilitated by the plasmid pCKF. Specific genomic polymorphisms were identified in sub-clades of MED isolates, which allow their identification with high precision. Additionally, comparative epigenomic analysis uncovered strain-specific cytosine methylation patterns at cg GATCG motifs, which may be linked to genome function regulation and adaptation to different hosts and environments. These findings demonstrate the effectiveness of long-read sequencing technologies in revealing both genetic and epigenetic features of bacterial pathogens, contributing to our understanding of the evolutionary mechanisms underlying the emergence and spread of this especially dangerous infection.

To ensure the biological safety of the country, it is necessary to develop priority areas of biotechnology, create advanced means of detecting pathogenic biological agents. Rickettsia bacteria, one of the most widespread zoonotic pathogens worldwide, continues to be a serious problem for public health. One of the solutions to the problems related to the situation of the effectiveness of rickettsiosis monitoring is the widespread introduction into clinical practice of modern diagnostic methods based on nucleic acid amplification (MANC) methods, in particular PCR. The paper presents the test results of experimental series of rickettsia detection kits. Purpose. Development and construction of experimental series of PCR test systems for the detection of rickettsioses, conducting control tests to work out optimal conditions in order to achieve maximum sensitivity and specificity of the drug.

This review provides a comprehensive overview of the genetic diversity and epidemiological potential of Yersinia pestis in Kazakhstan’s natural plague foci, emphasizing the link between genotypic variation and outbreak capacity. Integrating historical epidemiological records with contemporary microbiological and genomic data (including PCR, VNTR/MLVA, SNP analysis, and whole-genome sequencing), we evaluate core and accessory genome variations. The data reveal substantial regional heterogeneity. High-risk desert foci (Caspian and Aral regions) are dominated by the Medievalis biovar, including atypical genovariants lacking canonical markers. Conversely, high-mountain foci (Sarydzhaz, Talas) harbor the Antiqua and Talas biovars, primarily linked to enzootic circulation. Notably, the Ili River focus exhibits extreme genomic variability, featuring strains with plesiomorphic traits. Furthermore, the widespread distribution of mobile elements like the cryptic plasmid pCKF suggests significant horizontal transfer contributing to pathogen adaptation. Ultimately, Central Asian plague dynamics are driven by complex evolutionary and ecological interactions. Given climate change and expanding human–wildlife interfaces, continuous genomic and ecological surveillance is essential for the early detection of high-risk Y. pestis genovariants and improving public health preparedness.

It is well known that the earth's climate changes that occur as a result of global climate change are changing the biosphere of our planet as a whole. As a result, many animal species change their geographical ranges, seasonal activity, migration patterns, abundance and interaction with other species, including microorganisms, the facts of which are observed in the deserts of Kazakhstan. The main carrier of the causative agent of the plague in the desert natural focus of the Betpakdala plague of Kazakhstan is the great gerbil (Rhombonus opimus), where the plague epizootic was first discovered in 1959, the area of which was then 30.0 thousand. km² until 1990. Due to the rapid industrial development of the Betpakdala desert, the impact of global climate change on earth and other factors over the past 30 years, the area of this natural plague outbreak has increased by 50.12% (60.14 thousand km²) in the northern direction due to the biological transformation of the area of the main carrier, which led to the expansion of plague epizootics among rodents. At the same time, the plague microbe was also involved in the transformation process, increasing its natural area of the pistil (the area of distribution of the microbe), which increased the risk of infection of people with plague infection. The paper presents our results of epizootological monitoring for the period 2009–2022 (50.0 thousand km²) and laboratory studies of 522376 samples of field material for plague. The structure of the focus was shown, and the reason for the expansion of the settlement area of the rodent population was revealed. The number of sectors with different levels of epidemic danger and epizootic activity were determined, and the main phenotypic and genotypic properties of Yersinia pestis strains circulating in this natural plague focus were also given.