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Ixodes ricinus ticks survive flooding.

Johanna Rapp1, Andrea Springer1, Christina Strube1

  • 1Institute for Parasitology, Centre for Infection Medicine, University of Veterinary Medicine Hannover, Buenteweg 17, 30559 Hanover, Germany.

Ticks and Tick-Borne Diseases
|November 24, 2024
PubMed
Summary

Extreme weather events like floods increase disease risks. Ixodes ricinus ticks survived 25 days submerged and resumed activity, highlighting their resilience and potential to spread tick-borne diseases post-flooding.

Keywords:
Climate changeFloodingHard ticksIxodes ricinusTick-borne diseases, Transmission risk

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Area of Science:

  • Environmental Science
  • Ecology
  • Public Health

Background:

  • Climate change is increasing extreme weather events, impacting disease vector ecology.
  • Flooding events pose a significant threat to public health by potentially altering vector populations and behavior.
  • Ixodes ricinus is a primary vector for numerous tick-borne diseases in Europe.

Purpose of the Study:

  • To investigate the survival and activity of Ixodes ricinus ticks following a major flood event.
  • To assess the ecological impact of prolonged submersion on tick populations.
  • To evaluate the potential for increased disease transmission risk after extreme weather.

Main Methods:

  • Observation of a flooding event in Hanover, Germany (Winter 2023/2024).
  • Monitoring of Ixodes ricinus (nymphal and adult) survival and host-seeking behavior post-submersion.
  • Comparison of tick densities before and after the flood event.

Main Results:

  • Ixodes ricinus ticks survived prolonged submersion (25 days) during the Hanover flood.
  • Ticks resumed host-seeking activity within four weeks after water receded.
  • Post-flood tick densities were comparable to pre-flood levels, indicating high resilience.

Conclusions:

  • Ixodes ricinus demonstrates remarkable resilience to extreme weather events like prolonged flooding.
  • Submerged ticks can quickly regain activity, posing a continued risk for tick-borne disease transmission.
  • Public health strategies must consider the impact of climate change-driven floods on vector-borne disease ecology.