scholarly journals Ecological aspects of zoning the territory of the Saratov region by the risk level of formation of West Nile fever foci

2021 ◽  
pp. 3-15
Author(s):  
K. S. Zakharov ◽  
Sh. V. Magerramov ◽  
A. N. Matrosov
Keyword(s):  
Human Infection ◽  
Activity Period ◽  
Anthropogenic Factors ◽  
Risk Level ◽  
West Nile Fever ◽  
West Nile ◽  
Saratov Region ◽  
Blood Sucking ◽  
Landscape Mapping ◽  
Ecological Aspects

The modern period is characterized by the expansion of the areas of a number of dangerous infectious diseases, previously endemic only for the countries with tropical climate. As a result of Palearctic climate warming and humidification and under the influence of anthropogenic factors, foci of a new transmissible arboviral zoonosis – West Nile fever (WNF) – have been formed in the Saratov region. On the territory of Russia, the circulation of the West Nile virus (WNV) has been recorded since 1963, and cases of human infection have been detected since 1967. In the studied region, the circulation of the virus has been known since the mid-90s of the last century, and epidemic complications – since 2012. 142 cases of the disease were reported in 2012–2020. The ecological prerequisites for a wide circulation of WNV are associated with the increase in the number of birds – carriers, and arthropods – blood-sucking vectors, the longer activity period of mosquitoes and ticks owing to the reduced frosty season of the year. As a result of landscape mapping with the use of modern methods for decoding images of satellite maps and remote sensing of the Earth (ERS), data have been obtained that served as the basis for epidemiological WNF zoning. There are three types of potential WNF foci on the territory of the region, namely: natural, natural-anthropourgic, and anthropourgic ones. The total area of biocenoses has been established, where natural, natural-anthropourgic and anthropourgic WNF foci could be formed: 6619.94 km2, 1484.62 km2, and 70.4 km2, respectively. Cluster analysis of the environmental conditions in 38 administrative districts of the region has distinguished four groups differing in the risk level of infection of the population with West Nile fever. The data obtained are used for planning, substantiating and conducting surveys and preventive measures, and form the basis for predicting the epidemiological situation in the region.

scholarly journals WEST NILE FEVER IN THE SARATOV REGION IN 2013-2015

2017 ◽  
Vol 62 (5) ◽  
pp. 219-226
Author(s):  
E. V. Kazorina ◽  
T. Yu. Krasovskaya ◽  
A. V. Kazantsev ◽  
E. V. Naydenova ◽  
I. N. Sharova ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Clinical Samples ◽  
West Nile Fever ◽  
West Nile ◽  
Saratov Region ◽  
Stable Domain ◽  
Field Samples ◽  
Live Stock ◽  
Regional Population ◽  
The City

West Nile virus (WNV) circulation in the territory of Saratov region and its role in the infectious pathology were investigated. For this purpose, in studies conducted in 2013-2015, suspensions of bloodsucking arthropods, organs of birds and small mammals were analyzed for the presence of WNV markers (antigens and/or RNA). The seroprevalence level in live-stock animals and population of the region was evaluated; clinical samples from patients with symptoms compatible with West Nile fever (WNF) were analyzed. As a result of the investigations, WNV markers were detected in field samples gathered in natural biotopes and in the city of Saratov. Immunity to WNV was detected in horses. A stable domain of persons with immunity to this agent was revealed among regional population. Patients with WNF have been annually registered in the region since 2012. The obtained results confirm active circulation of WNF in the Saratov region, as well as formation of stable natural and anthropourgic foci.

scholarly journals Conditions for Virus Circulation and Premises for Natural West Nile Fever Foci Formation in the Territory of the Saratov Region

2013 ◽  
pp. 17-22
Author(s):  
A. N. Matrosov ◽  
V. N. Chekashov ◽  
A. M. Porshakov ◽  
S. A. Yakovlev ◽  
M. M. Shilov ◽  
...  
Keyword(s):  
West Nile Fever ◽  
West Nile ◽  
Saratov Region

scholarly journals Feasibility Study on Hemotransfusion Transmission of West Nile Fever Virus in the Territory of the Saratov Region

2015 ◽  
pp. 70-73 ◽  
Author(s):  
E. V. Kazorina ◽  
T. Yu. Krasovskaya ◽  
E. V. Naidenova ◽  
A. V. Kazantsev ◽  
E. N. Kalinina ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Fever Virus ◽  
West Nile Fever ◽  
West Nile ◽  
Saratov Region

scholarly journals Investigation of Live-Stock Animals Seroprevalence to West Nile Virus in the Territory of the Saratov Region

2020 ◽  
pp. 97-102
Author(s):  
E. V. Kazorina ◽  
T. Yu. Krasovskaya ◽  
A. V. Kazantsev ◽  
S. A. Shcherbakova ◽  
A. A. Chastov ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Test System ◽  
Agricultural Cooperatives ◽  
Left Bank ◽  
West Nile Fever ◽  
Serum Samples ◽  
West Nile ◽  
Saratov Region ◽  
Private Households ◽  
Live Stock

Aim – to determine the intensity of West Nile virus circulation in anthropogenic biotopes in the territory of the Saratov Region between 2012 and 2017. Materials and methods. 1454 blood serum samples from animals of private households and agricultural cooperatives in 14 districts of the Region were investigated: 1111 samples from horses and 343 samples from the cattle. Sera were examined for the presence of total antibodies to WNV using a test system registered in the Russian Federation to detect antibodies to this virus by a competitive enzyme immunoassay «ID Screen West Nile Competition Multi-species» («ID. Vet», France). Results and discussion. The share of resistant to WNV cohort of live-stock animals in the territory of the Saratov Region over the whole period of study was (14.0±0.9) %, particularly in horses – (15.9±1.1) %, and in the cattle – (7.9±1.5) %. The highest values were observed for horses. High level of resistance in live-stock animals was registered in the districts located on the left bank of the river Volga: central ones – Engels (36.4±5.5), Fedorovsky (29.0±4.6), and Sovetsky (20.0±3.7); southern districts – Rovensky (74.3±5.3 %) and Krasnokutsky (15.7±4.4), which confirms the assumption about the initial introduction of the virus from neighboring territories of the Volgograd Region into the territory of the Left Bank where there are characteristic near-water biotopes and active circulation of the agent takes place. The data obtained on the detection of the resistant live-stock animal cohort testify to the spread of West Nile virus in the territory of the surveyed districts of the Saratov Region and, in particular, anthropogenic biotopes which further points to the formation of persistent natural and natural-anthropourgic foci of West Nile fever.

scholarly journals The study of the area of distribution of west nile virus in the territory of the European part of Russia; the results of seroepidemiological research. report 1: Astrakhan region, Krasnodar region, Stavropol region, Saratov region

2016 ◽  
Vol 21 (5) ◽  
pp. 244-252
Author(s):  
Alina A. Kozlova ◽  
A. M Butenko ◽  
V. F Larichev ◽  
A. R Azarian ◽  
A. P Grishanova ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Neutralization Test ◽  
European Part ◽  
Research Report ◽  
West Nile Fever ◽  
West Nile ◽  
Saratov Region ◽  
European Part Of Russia ◽  
Stavropol Region ◽  
Krasnodar Region

Sera of inhabitants of the European part of Russia, collected in 2010-2013 were studied with the use of ELISA and neutralization test. Antibodies to West Nile virus were detected in 19.6% of cases in the Astrakhan region, 4.5% - in the Krasnodar region, 0.9% - in the Saratov region and 5.4% - in the Stavropol region. The coincidence of the results of the examination of sera in ELISA-IgG and neutralization test accounted of 80.7% in the Astrakhan region, 72.2% - in the Krasnodar region and 69.2% - in the Saratov region. The presented results correlate with the incidence and duration of known epidemiological activity of West Nile fever in the territories of these regions. Analysis of our data, as well as statistics of the morbidity rate of West Nile fever in the Volgograd and Rostov regions and Dagestan confirm endemic and expanding foci of this infection in the southern regions of Russia, currently including Astrakhan, Volgograd, Rostov, Saratov, Krasnodar and Stavropol regions and Dagestan. The most active and stable foci are located on the territory of Astrakhan, Volgograd and Rostov regions.

scholarly journals Detection of Specific Antibodies to Arboviruses in Blood Sera of People Living in the Territory of the Saratov Region

2011 ◽  
pp. 72-74 ◽  
Author(s):  
S. A. Shcherbakova ◽  
E. V. Naidenova ◽  
E. A. Bil`ko ◽  
E. A. Vodina ◽  
T. E. Logunova ◽  
...  
Keyword(s):  
West Nile Fever ◽  
West Nile ◽  
Climatic Zones ◽  
Specific Antibodies ◽  
Saratov Region

This work continues serological surveys previously carried out in the territory of the Saratov Region in order to detect specific antibodies to arboviruses. Presented are the results of analysis of blood sera of humans and agricultural animals collected in different climatic zones of the Saratov Region. Sera were examined for the presence of IgG immunoglobulins specific to the viruses Tahyna, Batai, Sindbis, tick-born encephalitis, CCHV, and West Nile fever.

West Nile fever upsurge in a Greek regional unit, 2020

Acta Tropica ◽  
2021 ◽  
pp. 106010
Author(s):  
Anna Papa ◽  
Katerina Tsioka ◽  
Sandra Gewehr ◽  
Stella Kalaitzopouou ◽  
Danai Pervanidou ◽  
...  
Keyword(s):  
West Nile Fever ◽  
West Nile ◽  
Regional Unit

Rhombencephalitis caused by West Nile fever virus

Neurology ◽  
2000 ◽  
Vol 55 (1) ◽  
pp. 153-153 ◽  
Author(s):  
C. A. Nichter ◽  
S. G. Pavlakis ◽  
U. Shaikh ◽  
K. A. Cherian ◽  
J. Dobrosyzcki ◽  
...  
Keyword(s):  
Fever Virus ◽  
West Nile Fever ◽  
West Nile

ANALYSIS OF TRENDS OF TOTAL EVAPORATION FLUXES (FOR 2003-2017) ACCORDING TO THE DATA OF PRODUCT MOD16A2 FOR THE TERRITORY OF THE MARKSOVSKY DISTRICT OF THE SARATOV REGION

2021 ◽  
pp. 16-25
Author(s):  
O. S. ERMOLAEVA ◽  
◽  
A. M. ZEYLIGER
Keyword(s):  
Time Series ◽  
Irrigation System ◽  
Growing Season ◽  
Half Period ◽  
Anthropogenic Factors ◽  
Time Interval ◽  
Total Evaporation ◽  
Saratov Region ◽  
Growing Seasons ◽  
Dominant Part

This paper presents the results of calculations of areal trends of total evaporation ETa fl uxes for the growing periods of 2003-2017 in the territory of the Marksovsky district of the Saratov region. Raster layers formed for the territory with a 500 m resolution of the Eta8 (Eta 8-day averaging) for each year of the investigated time interval were obtained from tiles sets h20v03 of the product MOD16A2 for the period from May 25 to September 2 of the corresponding year. As a result, the 19830 time series of total evaporation fl uxes for the ETaw growing seasons of the 15-year study period were drawn up for the Marksovsky district. The obtained time series of geodata of the actual evapotranspiration for the growing season ETaw for each of the 15 studied years were used for the spatial analysis of ETaw trends. For the analysis, the method of nonparametric Mann-Kendal statistics was used. It revealed the presence of 2 half-periods with diametrically opposite trends in the dominant part of time series. The fi rst half-period found out negative values (downward) trends and falls on 2003-2010, the second half-period showed positive (upward) trends for 2010-2017. The presented results of the spatial distribution of both trends indicate the presence of an infl uence on ETaw both distance from the bank of R. Volga and anthropogenic factors. Hypotheses for additional analysis are proposed. For the visual deciphering of the places of abnormal values of trends velocities of the both half-periods there were used space photos of high resolution. As a result it was marked that the location of these anomalies corresponded to the location of pivot sprinklers in the territory of the Privolzhskoj irrigation system.

scholarly journals Increase in human West Nile and Usutu virus infections, Austria, 2018

2018 ◽  
Vol 23 (43) ◽  
Author(s):  
Stephan W. Aberle ◽  
Jolanta Kolodziejek ◽  
Christof Jungbauer ◽  
Karin Stiasny ◽  
Judith H. Aberle ◽  
...  
Keyword(s):  
West Nile Virus ◽  
Blood Donors ◽  
Blood Donation ◽  
Virus Infections ◽  
West Nile Fever ◽  
West Nile ◽  
Usutu Virus ◽  
Neuroinvasive Disease ◽  
Human West Nile Virus ◽  
Imported Cases

Between 28 June and 17 September 2018, 27 cases of human West Nile virus infections were recorded in Austria; four cases of West Nile neuroinvasive disease, 11 cases of West Nile fever, six infections detected by blood donation screening and six imported cases. In addition, 18 cases of human Usutu virus infections (all blood donors) were recorded. This is the highest number of annual infections recorded in Austria since the introduction of both viruses.

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