scholarly journals Regression mathematical modeling of the population of mouse-like rodents, hosts of blood-sucking arthropods in the Non-Black Earth Zone by the example of the Kaluga Region

2021 ◽  
Vol 15 (3) ◽  
pp. 54-63
Author(s):  
F. I. Vasilevich ◽  
A. M. Nikanorova ◽  
V. V. Kalmykov ◽  
A. I. Selyutina
Keyword(s):  
Mathematical Modeling ◽  
Small Mammals ◽  
Atmospheric Pressure ◽  
Ixodid Ticks ◽  
Climate Conditions ◽  
Vector Borne Diseases ◽  
Blood Sucking ◽  
Two Factors ◽  
Vector Borne ◽  
Kaluga Region

The purpose of the research is a regression mathematical modeling of the population of small mammals, hosts of ixodid ticks in the Kaluga Region, which allows assessing the likelihood of zoonotic and vector-borne diseases.Materials and methods. For 10 years (from 2009 to 2019), a 2k multifactorial experiment was performed in the field by the method of V. V. Kalmykov (2016). The study object was mouse-like rodents that are the most common in the Kaluga Region. Rodents were counted by standard methods using techniques of V. N. Shnitnikov (1929), P. B. Yurgenson (1934) and A. N. Formozov (1937). The generally accepted steel spring traps were used. Animals were counted throughout all habitats.Results and discussion. Regression mathematical models of the mouse-like rodent population were obtained depending on the average monthly temperature, precipitation and atmospheric pressure for the year in the Non-Black Earth Zone by the example of the Kaluga Region. The specific nature of the obtained analytical model is that the greatest influence on the population of small mammals is made by the interaction effect of two factors, temperature and atmospheric pressure. Their impact is more significant than the influence of each of the three study factors separately, in particular, it is stronger than the only influence of temperature by 1.02, the only impact of precipitation by 2.58, and the only impact of atmospheric pressure by 2.72. The analytic mathematical model allows us to calculate, without significant material or time costs, populations of mouse-like rodents not only in the Kaluga Region, but also in regions with similar climate conditions.

scholarly journals Mathematical modeling of ixodiс ticks and their hosts of the Non-Black Earth Zone

2020 ◽  
pp. 286-290
Author(s):  
Nikanorova
Keyword(s):  
Mathematical Modeling ◽  
Air Temperature ◽  
Small Mammals ◽  
Atmospheric Pressure ◽  
Opposite Effect ◽  
Climatic Factors ◽  
Exogenous Factors ◽  
Vector Borne ◽  
Kaluga Region ◽  
The Impact

The article discusses the impact of exogenous factors on the population of ixodic ticks and small mammals. It is known that parasitic arthropods, mouse-like rodents are very susceptible to changes in climatic factors of a certain habitat. For the development of their population, it is necessary to study many factors: a certain air temperature, humidity or rainfall, daylight hours, cloud cover, and atmospheric pressure. The survival of small mammals, and therefore the number of ticks in the future, depends on exogenous factors. Mathematical modeling in parasitology opens up great opportunities for predicting outbreaks of vector-borne infections and infestations without serious material costs. As a result, calculation models of small mammals for the Kaluga Region and data on the most influence of the average atmospheric pressure, air temperature, and humidity on the arthropod population were obtained. The higher the ambient temperature is within the normal range for a certain territory, the more favorable the conditions for propagation are. Rainfall has the opposite effect. The analysis of the obtained model by ixodic ticks shows the strongest effect on the arthropod population of average atmospheric pressure. The advantage of the applied modeling allows taking into account the impact on the observed object of a combination of all factors and their interaction effects.

scholarly journals Mathematical modeling of ixodic ticks of the Non-Black Earth Zone

2020 ◽  
pp. 281-285
Author(s):  
Nikanorova
Keyword(s):  
Mathematical Modeling ◽  
Atmospheric Pressure ◽  
Climatic Factors ◽  
Dermacentor Reticulatus ◽  
Simultaneous Increase ◽  
Monthly Average ◽  
Exogenous Factors ◽  
Vector Borne ◽  
Kaluga Region ◽  
The Impact

The article discusses the impact of exogenous factors on the population of ixodic ticks. It is known that parasitic arthropods including ixodic ticks, are very susceptible to changes in climatic factors of a certain habitat. For the development of a population, it is necessary to study many factors: a certain air temperature, humidity or rainfall, daylight hours, cloud cover, and atmospheric pressure. The choice and number of hosts, the time limits of bloodsucking and diapause, and activity peaks depend on exogenous factors. In the Kaluga Region, cases of hemosporidial infections, anaplasmosis among animals, and borreliosis among people are recorded annually. Two species of ixodic ticks live in the Region: Ixodes ricinus and Dermacentor reticulatus. Mathematical modeling in parasitology opens up great opportunities for predicting outbreaks of vector-borne infections and infestations without serious material costs. As a result, data were obtained on the strongest effect on the arthropod population of mean atmospheric pressure. With a simultaneous increase in the monthly average values of temperature, humidity and atmospheric pressure, the number of active ixodic ticks will decrease. The advantage of the applied modeling allows taking into account the impact on the observed object of a combination of all factors and their interaction effects.

The Scientific Basis for the Prevention of Zooanthroponoze Vector-Borne Diseases Spread by Parasitic Arthropods of the Center of the East European Plain

2020 ◽  
Vol 14 (1) ◽  
pp. 81-88
Author(s):  
Fedor I. Vasilevich ◽  
Anna M. Nikanorova
Keyword(s):  
Mathematical Models ◽  
Culex Pipiens ◽  
Preventive Measures ◽  
Mosquito Species ◽  
Natural Habitat ◽  
Piperonyl Butoxide ◽  
East European Plain ◽  
Vector Borne Diseases ◽  
Vector Borne ◽  
Kaluga Region

The purpose of the research is development of preventive measures against zooanthroponoze vector-borne diseases spread by parasitic arthropods in the Kaluga Region. Materials and methods. The subject of the research was Ixodidae, mosquitoes, and small mammals inhabiting the Kaluga Region. The census of parasitic arthropods was carried out on the territory of all districts of the Kaluga Region and the city of Kaluga. Open natural habitat and human settlements were investigated. Weather conditions from 2013 to 2018 were also taken into account. For the purposes of the study, we used standard methods for capturing and counting arthropods and mouse-like rodents. In order to obtain mathematical models of small mammal populations, a full factorial experiment was conducted using the collected statistical data. In-process testing of the drug based on s-fenvalerate and piperonyl butoxide were carried out under the conditions of the agricultural collective farm “Niva” of the Kozelsky District, the Kaluga Region, and LLC “Angus Center of Genetics” of the Babyninsky District, the Kaluga Region. Results and discussion. In the Kaluga Region, two species of ixodic ticks are found, namely, Ixodes ricinus and Dermacentor reticulatus, which have two activity peaks. Mosquito may have 3-4 generations in a year in the Kaluga region. The most common mosquito species in the Kaluga Region are Aedes communis, Ae. (Och.) togoi and Ae. (Och.) diantaeus, Culex pipiens Culex Linnaeus, 1758 (Diptera, Culicidae) (Culex pipiens): Cx. pipiens f. pipiens L. (non-autogenic form) and Cx. p. f. molestus Fors. (autogenic form), which interbreed, and reproductively isolated in the Region. The developed mathematical models make it possible to quantify the risks of outbreaks of zooanthroponoze vector-borne diseases without the cost of field research, and allow for rational, timely and effective preventive measures. Medications based on s-fenvalerate and piperonyl butoxide and based on cyfluthrin showed high insecto-acaricidal efficacy and safety.

scholarly journals Small mammals of the Kaluga region – reservoirs of dangerous zoonotic diseases

2020 ◽  
pp. 291-294
Author(s):  
Nikanorova ◽  
Kozlov
Keyword(s):  
Small Mammals ◽  
Mus Musculus ◽  
Rattus Norvegicus ◽  
Zoonotic Diseases ◽  
Myodes Glareolus ◽  
Field Mouse ◽  
Vector Borne ◽  
Kaluga Region ◽  
The City ◽  
Small Forest

The article considers the issues of carriage by small mammals of dangerous zoonotic diseases: leptospirosis, tularemia, hantaviruses. Data on the detection of antigens to pathogens in the districts of the Kaluga region are presented. As you know, small mammals are the main link in maintaining zoonotic natural focal diseases. The larval phases of ixodic ticks, mosquitoes and other parasitic arthropods prefer to feed on the blood of mouse rodents, which contributes to the spread of vector-borne infections and infestations. The following species of mouse rodents are found in the Kaluga Region: small forest mouse (Apodemus uralensis), gray vole, red vole (Myodes glareolus), field mouse (Apodemus agrarius), gray rat (Rattus norvegicus), and house mouse (Mus musculus). In natural biotopes, field species prevail in number: field mouse, gray vole, red vole. In the Kaluga region, antigens for tularemia, hantaviruses, and leptospirosis were found in small mammals in 4.9–9.4% of the studied animals on average per year. Of particular concern are the city of Kaluga, Borovsky, Babyninsky, Yukhnovsky, Ulyanovsk, Medynsky, Maloyaroslavetsky, Meshchovsky, Peremyshlsky, Kozelsky, Dzerzhinsky and Ulyanovsk districts. The data obtained indicate the stationarity of these diseases in the territory of the Kaluga region.

Molecular Characterization of Some Equine Vector-Borne Pathogens and Identification of Their Vectors in Egypt

2020 ◽  
Author(s):  
Hend H.A.M. Abdullah ◽  
Dina Aboelsoued ◽  
Tarek K Farag ◽  
Kadria N Abdel Megeed ◽  
Sobhy Abdel-Shafy ◽  
...  
Keyword(s):  
Molecular Techniques ◽  
Ixodid Ticks ◽  
Morphological Identification ◽  
Vector Borne Diseases ◽  
Maldi Tof ◽  
Vector Borne ◽  
First Time ◽  
Multiple Pathogens ◽  
Apparently Healthy

Abstract Background Equine vector borne diseases (EVBD) have been considered emerging and reemerging diseases transmitted by arthropods and most of these diseases have zoonotic concern. This study was designed to screen EVBD in equines and their vectors using molecular analyses and identify vectors by MALDI-TOF and molecular techniques.Methods A total of 335 blood samples were collected from apparently healthy equines (320 from horses and 15 from donkeys) from Cairo and Beni-Suef provinces in Egypt. A total of 166 arthropods (105 sucking flies and 61 ticks) were collected from the same animals. MALDI-TOF and molecular techniques were used to confirm the findings of morphological identification of vector. Quantitative PCR and Standard PCR coupled with sequencing were performed in equines and vectors DNA for screening multiple pathogens.Results MALDI-TOF and molecular techniques confirmed that Hippoposca equina (louse fly), Rhipicephalus annulatus (Rh. annulatus) and Rh. microplus ixodid ticks were found. In vectors, we identified Anaplasma marginale (A. marginale; 1.6%), A. platys-like (1.6%) and a new Ehrlichia sp. (4.9%) in Rh. microplus, while Ehrlichia rustica (E. rustica) was found in Rh. microplus and Rh. annulatus. Likewise, Borrelia theileri was identified in Rh. microplus (3.3%). For H. equina, Anaplasma and Borrelia sp. DNA were detected by qPCR only. In equines, A. marginale (0.6%), A. ovis (0.6%) and Theileria ovis (T. ovis; 0.6%) were found in donkeys. In horses, T. equi (1.2%) and a new Theileria sp. Africa (2.7%) were identified.Conclusions For the first time, we reported here the presence of Rh. microplus as a competent tick for Rh. annulatus in Egypt using MALDI-TOF and molecular identification. To the best of our knowledge, we provided the first detection of different pathogens as A. marginale, A. platys-like, E. rustica, new Ehrlichia sp., B. theileri in Rh. microplus, A. marginale, A. ovis and T. ovis in donkeys and a new Theileria sp. Africa in horses in Egypt.

scholarly journals ANALYTICAL MATHEMATICAL MODELS OF THE POPULATION OF ARTHROPODS IN THE NON-BLACK EARTH ZONE

2021 ◽  
pp. 128-132
Author(s):  
Vasilevich ◽  
Nikanorova
Keyword(s):  
Mathematical Models ◽  
Atmospheric Pressure ◽  
Control Area ◽  
Ixodid Ticks ◽  
Mean Values ◽  
Average Temperature ◽  
Monthly Average ◽  
Monthly Average Temperature ◽  
Blood Sucking ◽  
Average Precipitation

The article provides an example of mathematical analytical modeling of the population size of blood-sucking arthropods on the example of mosquitoes and ixodid ticks that inhabit the Kaluga Region. The presented analytical mathematical models make it possible to clearly assess the influence of environmental factors on parasite populations. The following factors were taken into account: average temperature (monthly and yearly, t, oС); average precipitation (monthly and yearly, S, mm); mean atmospheric pressure (P, mm Hg) for mosquitoes, and monthly average temperature (t, o С), monthly mean relative humidity (Q, %), and mean atmospheric pressure (P, mm Hg) for ixodid ticks. The analysis of the obtained models shows that under weather conditions when monthly mean values of the considered factors are at a zero level, the estimated number of ixodid ticks and mosquitoes will be 1150 and 1529 individuals in the control area per year. The population of ixodid ticks is most significantly influenced by the mean atmospheric pressure; its influence is twice as strong as monthly mean humidity and 6.4 times stronger than the influence of monthly average temperature. The "+" sign indicates that the higher the atmospheric pressure is, the more active ticks are observed. Monthly average precipitation has the greatest effect on the mosquito population.

scholarly journals Larvicidal Activity of Elytraria acaulis against Culex quinquefasciatus and Aedes aegypti (Diptera: Culicidae)

2020 ◽  
Author(s):  
Soorya Sukumaran ◽  
Rajan Maheswaran
Keyword(s):  
Aedes Aegypti ◽  
Larvicidal Activity ◽  
Culex Quinquefasciatus ◽  
Probit Analysis ◽  
Human Beings ◽  
Vector Borne Diseases ◽  
Blood Sucking ◽  
Leaf Powder ◽  
Vector Borne ◽  
Chemical Pesticides

Background: Mosquitoes are blood sucking arthropods and serve as vectors of many diseases causing serious health problems to human beings. Culex quinquefasciatus and Aedes aegypti were responsible for Filariasis and Dengue. Syn­thetic pesticides were effective against mosquitoes as well as main sources of environmental pollution and most of them are immunosuppressant. Botanicals were widely used as insecticides, growth disruptors, repellents, etc. The aim of this research was to determine larvicidal properties of powdered leaf, Elytraria acaulis against late third or early fourth in­star larvae of Cx. quinquefasciatus and Ae. aegypti. Methods: Larvae of Cx. quinquefasciatus and Ae. aegypti were tested at various concentrations of 100, 120, 140, 160, 180 and 200mg/100ml and mortality was recorded after 24h. The LC50 values of the E. acaulis leaf powder were calcu­lated by Probit analysis. Results: The plant powder exhibited strong larvicidal activity against Cx. quinquefasciatus with LC50 value of 116.07mg/100ml against Ae. aegypti 124.25mg/100ml respectively. The result indicated that the plant powder of E. acaulis showed potential larvicidal activity against Cx. quinquefasciatus and Ae. aegypti. Conclusion: The overall findings of the present investigation suggested that the E. acaulis highly effective against Cx. quinquefasciatus and Ae. aegypti larvae. Elytraria acaulis may be used as an alternative to synthetic chemical pesticides for control of vectors to reduce vector borne diseases and did not harm to total environment.

METHODOLOGICAL GUIDE ON DISINSECTION AND DISACARISATION IN THE CENTERS FOR INTRODUCTION AND REINTRODUCTION OF ANIMALS

2021 ◽  
Vol 1 (3) ◽  
pp. 303-308
Author(s):  
P.I. Khristianovsky ◽  
◽  
I.S. Ponomareva ◽  
D.A. Grudinin ◽  
E.N. Kuzmina ◽  
...  
Keyword(s):  
Veterinary Medicine ◽  
Parasitic Diseases ◽  
Vector Borne Diseases ◽  
Animal Diseases ◽  
Blood Sucking ◽  
Natural Foci ◽  
Vector Borne ◽  
The Russian Federation ◽  
Scientific Station ◽  
Academy Of Sciences

Introduction and reintroduction requires the movement of different groups of animals over considerable distances. In this case, there is a risk of the spread of infectious and parasitic diseases. The current veterinary rules and requirements contain instructions on measures for the import (movement) of zoo and circus animals, but there are no instructions on animals in protected areas. This paper proposes options for disinsection and disacarisation of various objects at the points of introduction and reintroduction of animals, based on the instructions approved by the Department of Veterinary Medicine of the Ministry of Agriculture of the Russian Federation. The work was carried out in connection with the need to develop recommendations to prevent the spread of infectious and invasive animal diseases, including anthropozoonoses, on the territory of the steppe scientific station of the Steppe Institute of the Ural Branch of the Russian Academy of Sciences «Orenburg Tarpania». One of the significant risks in the introduction of animals is the presence of natural foci of vector-borne diseases in the model area. To eliminate these risks, it is necessary to spray animals with insectoacaricides of the pyrethroid group when importing animals. At reintroduction points, carry out regular arachnoentomological monitoring of the area. With an increase in the number of blood-sucking arthropods, it is necessary to apply insectoacaricides by spraying biotopes. When a vector-borne disease appears, spray both biotopes and the animals themselves to break the epizootic chain.

Adaptation of Animal and Human Health Surveillance Systems for Vector-Borne Diseases Accompanying Climate Change

2020 ◽  
Vol 48 (4) ◽  
pp. 694-704
Author(s):  
Sam F. Halabi
Keyword(s):  
Climate Change ◽  
Infectious Diseases ◽  
Human Health ◽  
Disease Surveillance ◽  
Surveillance Systems ◽  
Climate Conditions ◽  
Vector Borne Diseases ◽  
Disease Surveillance System ◽  
Vector Borne ◽  
Inspection Service

Anthropogenic climate change is causing temperature rise in temperate zones resulting in climate conditions more similar to subtropical zones. As a result, rising temperatures increase the range of disease-carrying insects to new areas outside of subtropical zones, and increased precipitation causes flooding that is more hospitable for vector breeding. State governments, the federal government, and governmental agencies, like the Animal and Plant Health Inspection Service (APHIS) of USDA and the National Notifiable Disease Surveillance System (NNDSS) of the U.S. Centers for Disease Control and Prevention, lack a coordinated plan for vector-borne disease accompanying climate change. APHIS focuses its surveillance primarily on the effect of illness on agricultural production, while NNDSS focuses on the emergence of pathogens affecting human health. This article provides an analysis of the current framework of surveillance of, and response to, vector-borne infectious diseases, the impacts of climate change on the spread of vector-borne infectious diseases, and recommends changes to federal law to address these threats.

scholarly journals Transmissible parasitic zoonoses of the Kaluga Region

2020 ◽  
Vol 14 (4) ◽  
pp. 50-56
Author(s):  
F. I. Vasilevich ◽  
A. M. Nikanorova
Keyword(s):  
Causative Agent ◽  
Mosquito Species ◽  
Dermacentor Reticulatus ◽  
Ixodid Ticks ◽  
Abundance Index ◽  
Granulocytic Anaplasmosis ◽  
Blood Sucking ◽  
Parasitic Zoonoses ◽  
Kaluga Region ◽  
The Government

the purpose of the research is monitoring population and species composition of common blood-sucking ectoparasites of the Kaluga Region, mosquitoes and ixodid ticks, and parasitic zoonoses, in the circulation of which they are involved.Materials and methods. The records were made in all districts of the Kaluga Region and in the city of Kaluga. We studied open meadow-field and forest-shrub stations, closed meadow-field and near-water stations, and settlement stations. The species was identified using the atlases of ixodid ticks by I. M. Ganiev, A. A. Aliverdiev (1968) and V. N. Shevkoplyas (2008), and the guidance of R. M. Gornostaeva (1999). The situation with transmissible parasitic zoonoses in the Kaluga Region was assessed based on the analysis of information from open sources of the Hygienic and Epidemiological Center of the Kaluga Region and the Veterinary Committee under the Government of the Kaluga Region.Results and discussion. There are two species of ixodid ticks in the Kaluga region: Ixodes ricinus and Dermacentor reticulatus. The abundance index of ixodid ticks of the species I. ricinus is 16.8±1.32 individuals per 1 flag-hour in forest biotopes, and 11.6±1.12 individuals per 1 flag-hour in meadow biotopes, and the abundance index of D. reticulatus is 10,8±1.14 and 15.9±1.30 individuals per 1 flag-hour, respectively. Three mosquito species prevail, namely, Stegomya communis, S. vexans, and Culex pipiens. The maximum number was 8 thousand per 1 m3. During the study period, the causative agent of infectious tick-borne borreliosis was found on average in 10.6% of ixodid ticks collected from humans and in 13.2% of ticks collected in natural biotopes. The causative agent of human granulocytic anaplasmosis was isolated on average in 3.1% of ixodid ticks collected from humans and 6.4% of those collected in natural biotopes. Infection rate for I. ricinus ticks infected with pathogen of infectious tick-borne borreliosis was 16.9%, and D. reticulatus 12.3%.

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