Influence of Abiotic Factors on Infectious Agents Environmentally Associated with Ixodidae Ticks on the Example of Borrelia and Tick-Borne Encephalitis Virus

Сироткин, М. Б.; Éi, Korenberg

doi:10.1134/s2079086419060070

Cited by 3 publications

(4 citation statements)

References 52 publications

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“…This may be considered as counter intuitive, since higher temperatures typically favor the development of ticks at all stages. Presumably during the warmer tick season, the prevailing species is I. ricinus , which is less contaminated by borrelia [ 40 ]. The link to hydrothermal index points at the importance of moisture availability and the balance between temperature and humidity.…”

Section: Resultsmentioning

confidence: 99%

“…The difference with our results can be due to the different data set or due to the different disease considered as borreliosis is a bacterial disease, whereas encephalitis is viral. In the north and south, there are different encephalitis strains, with the northern strain being highly virulent [ 40 ]; thus, increase of encephalitis incidence rates can be expected.…”

Section: Discussionmentioning

confidence: 99%

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The impact of climatic factors on tick-related hospital visits and borreliosis incidence rates in European Russia

et al. 2022

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Tick-borne diseases are among the challenges associated with warming climate. Many studies predict, and already note, expansion of ticks’ habitats to the north, bringing previously non-endemic diseases, such as borreliosis and encephalitis, to the new areas. In addition, higher temperatures accelerate phases of ticks’ development in areas where ticks have established populations. Earlier works have shown that meteorological parameters, such as temperature and humidity influence ticks’ survival and define their areas of habitat. Here, we study the link between climatic parameters and tick-related hospital visits as well as borreliosis incidence rates focusing on European Russia. We have used yearly incidence rates of borreliosis spanning a period of 20 years (1997-2016) and weekly tick-related hospital visits spanning two years (2018-2019). We identify regions in Russia characterized by similar dynamics of incidence rates and dominating tick species. For each cluster, we find a set of climatic parameters that are significantly correlated with the incidence rates, though a linear regression approach using exclusively climatic parameters to incidence prediction was less than 50% effective. On a weekly timescale, we find correlations of different climatic parameters with hospital visits. Finally, we trained two long short-term memory neural network models to project the tick-related hospital visits until the end of the century, under the RCP8.5 climate scenario, and present our findings in the evolution of the tick season length for different regions in Russia. Our results show that the regions with an expected increase in both tick season length and borreliosis incidence rates are located in the southern forested areas of European Russia. Oppositely, our projections suggest no prolongation of the tick season length in the northern areas with already established tick population.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The impact of climatic factors on tick-related hospital visits and borreliosis incidence rates in European Russia

et al. 2022

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“…Relative humidity is a crucial factor in deciding tick survival as ticks are very sensitive to desiccation, which might also affect the virus in the tick; however, very little is known about the effect of RH in TBEV prevalence in ticks (Danielová, 1990; Danielová et al, 1983; Korenberg, 2009; Sirotkin & Korenberg, 2019). This study suggests that humidity may play a major role in influencing TBEV prevalence in ticks in southern Scandinavia.…”

Section: Discussionmentioning

confidence: 99%

“…It is important to note that the direct effect of temperature and humidity conditions on TBEV is practically unknown (Korenberg, 2009). It is usually agreed that microorganisms in ticks are generally well adapted to the variability of temperature and humidity as well as other environmental conditions that are important for reproduction, vertical and horizontal transmission (Sirotkin & Korenberg, 2019). Although the TBEV infection in ticks is affected by both temperature and relative humidity (RH), RH has been suggested to be the major determinant for infection rate rather than temperature (Danielová et al, 1983).…”

Section: Introductionmentioning

confidence: 99%

Prevalence of tick‐borne encephalitis virus in questing Ixodes ricinus nymphs in southern Scandinavia and the possible influence of meteorological factors

Lamsal,

Edgar,

Jenkins

et al. 2023

Zoonoses and Public Health

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Ixodes ricinus ticks are Scandinavia's main vector for tick‐borne encephalitis virus (TBEV), which infects many people annually. The aims of the present study were (i) to obtain information on the TBEV prevalence in host‐seeking I. ricinus collected within the Øresund‐Kattegat‐Skagerrak (ØKS) region, which lies in southern Norway, southern Sweden and Denmark; (ii) to analyse whether there are potential spatial patterns in the TBEV prevalence; and (iii) to understand the relationship between TBEV prevalence and meteorological factors in southern Scandinavia. Tick nymphs were collected in 2016, in southern Scandinavia, and screened for TBEV, using pools of 10 nymphs, with RT real‐time PCR, and positive samples were confirmed with pyrosequencing. Spatial autocorrelation and cluster analysis was performed with Global Moran's I and SatScan to test for spatial patterns and potential local clusters of the TBEV pool prevalence at each of the 50 sites. A climatic analysis was made to correlate parameters such as minimum, mean and maximum temperature, relative humidity and saturation deficit with TBEV pool prevalence. The climatic data were acquired from the nearest meteorological stations for 2015 and 2016. This study confirms the presence of TBEV in 12 out of 30 locations in Denmark, where six were from Jutland, three from Zealand and two from Bornholm and Falster counties. In total, five out of nine sites were positive from southern Sweden. TBEV prevalence of 0.7%, 0.5% and 0.5%, in nymphs, was found at three sites along the Oslofjord (two sites) and northern Skåne region (one site), indicating a potential concern for public health. We report an overall estimated TBEV prevalence of 0.1% in questing I. ricinus nymphs in southern Scandinavia with a region‐specific prevalence of 0.1% in Denmark, 0.2% in southern Sweden and 0.1% in southeastern Norway. No evidence of a spatial pattern or local clusters was found in the study region. We found a strong correlation between TBEV prevalence in ticks and relative humidity in Sweden and Norway, which might suggest that humidity has a role in maintaining TBEV prevalence in ticks. TBEV is an emerging tick‐borne pathogen in southern Scandinavia, and we recommend further studies to understand the TBEV transmission potential with changing climate in Scandinavia.

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Adaptive Features of the Biology of Closely Related Species of Ixodid Ticks That Determine Their Distribution (Illustrated on the Example of the Taiga Tick Ixodes persulcatus Sch. 1930 and the Castor Bean Tick Ixodes ricinus L. 1758)

2021

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Influence of Abiotic Factors on Infectious Agents Environmentally Associated with Ixodidae Ticks on the Example of Borrelia and Tick-Borne Encephalitis Virus

Cited by 3 publications

References 52 publications

The impact of climatic factors on tick-related hospital visits and borreliosis incidence rates in European Russia

The impact of climatic factors on tick-related hospital visits and borreliosis incidence rates in European Russia

Prevalence of tick‐borne encephalitis virus in questing Ixodes ricinus nymphs in southern Scandinavia and the possible influence of meteorological factors

Adaptive Features of the Biology of Closely Related Species of Ixodid Ticks That Determine Their Distribution (Illustrated on the Example of the Taiga Tick Ixodes persulcatus Sch. 1930 and the Castor Bean Tick Ixodes ricinus L. 1758)

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