Role of Mosquitoes, 
                  &lt;I&gt;Culex&lt;/I&gt;
                  &lt;I&gt;pipiens&lt;/I&gt; Complex, in West Nile Fever Virus Persistence in Urbanized Biocoenoses of Saratov

Поршаков, А. М.; Яковлев, С. А.; Захаров, К. С.; Matrosov, A. N.; Kniazeva, Tatiana; Кузнецов, А. А.; Чекашов, В. Н.; Shilov, M. M.; Tolokonnikova, S. I.; Казорина, Е. В.; Красовская, Т. Ю.; Найденова, Е. В.; Sharova, I. N.; Щербакова, Светлана; Попов, Н. В.

doi:10.21055/0370-1069-2014-2-66-68

Cited by 3 publications

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“…However, vertical passage is not efficient for permanent maintenance over many generations without amplification by horizontal transmission, although this might be an additional driver of transmission. In basements, the optimal microclimate for the year-round development of mosquitoes is present [ 62 ], thereby maintaining the persistence of the virus during the interepidemic period. Some studies showed that higher temperatures did not increase the transmission rates of biotype molestus [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

Spatial patterns of West Nile virus distribution in the Volgograd region of Russia, a territory with long-existing foci

et al. 2022

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Southern Russia remains affected by West Nile virus (WNV). In the current study, we identified the spatial determinants of WNV distribution in an area with endemic virus transmission, with special reference to the urban settings, by mapping probable points of human infection acquisition and points of virus detection in mosquitoes, ticks, birds, and mammals during 1999–2016. The suitability of thermal conditions for extrinsic virus replication was assessed based on the approach of degree-day summation and their changes were estimated by linear trend analysis. A generalized linear model was used to analyze the year-to-year variation of human cases versus thermal conditions. Environmental suitability was determined by ecological niche modelling using MaxEnt software. Human population density was used as an offset to correct for possible bias. Spatial analysis of virus detection in the environment showed significant contributions from surface temperature, altitude, and distance from water bodies. When indicators of location and mobility of the human population were included, the relative impact of factors changed, with roads becoming most important. When the points of probable human case infection were added, the percentage of leading factors changed only slightly. The urban environment significantly increased the epidemic potential of the territory and created quite favorable conditions for virus circulation. The private building sector with low-storey houses and garden plots located in the suburbs provided a connection between urban and rural transmission cycles.

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Section: Discussionmentioning

confidence: 99%

Spatial patterns of West Nile virus distribution in the Volgograd region of Russia, a territory with long-existing foci

et al. 2022

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West Nile Fever in the Saratov Region in 2013-2015

Казорина¹,

Krasovskaya²,

Казанцев³

et al. 2017

Problems of Virology

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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.

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Methodological approaches to assessment of the decline for health risk reduction from mosquito bites due to the application of repellents and insecticides

Шур

Redko

Khrushcheva

et al. 2021

Hygiene and Sanitation

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Introduction. The use of repellents and insecticides is the most important method of protection against mosquitoes. In the scientific literature, there is practically no information about the risk from mosquito bitesl to human health due to the non-use of these funds. The information on the prevalence, infection of mosquito-carriers of infectious agents was studied; biological risks from non-use of repellents and insecticides. The aim of the study is to develop methodological approaches to assessing the reduction of health risk from mosquito bites due to the use of repellent and insecticidal agents. Materials and methods. The methods of studying relevant scientific literature, analysis of statistical reporting data, the main stages of the methodology for assessing health risks were used. Results. The proposed methodological approaches have been tested in various scenarios for the use of repellents and insecticides in comparison with the averted risks associated with the development of infectious diseases carried by mosquitoes. Conclusion. For the implementation of methodological approaches, scenarios and parameters of the development of the situation with the use of repellents and insecticides or their non-use are proposed. Indicators of individual, population and prevented health risks were calculated, considering the severity of harm to health. The personal health risk of West Nile fever (WNF) and dirofilariasis in non-endemic areas without application repellents and insecticides is assessed as acceptable - 1.2•10-8 and 1.7•10-5, respectively. At the territory with constantly recorded WNV incidence, the application of repellents or insecticides diminished the population risk of contracting fever by ten times. The averted health risk is 0.297 cases per 2.8 million population. When using repellents or insecticides, the population risk of dirofilariasis is significantly reduced. The averted health risk is 8.8 cases per population of 579 103 people.

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Role of Mosquitoes, <I>Culex</I> <I>pipiens</I> Complex, in West Nile Fever Virus Persistence in Urbanized Biocoenoses of Saratov

Cited by 3 publications

References 0 publications

Spatial patterns of West Nile virus distribution in the Volgograd region of Russia, a territory with long-existing foci

Spatial patterns of West Nile virus distribution in the Volgograd region of Russia, a territory with long-existing foci

West Nile Fever in the Saratov Region in 2013-2015

Methodological approaches to assessment of the decline for health risk reduction from mosquito bites due to the application of repellents and insecticides

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