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Research Seminar No.189, 23 July 2018
16:30-, The Interdivisional Education and Research Building, 5th Floor
「Ixodid Ticks in Amami-oshima Island and Lifecycle of Tick-borne Phleboviruses」
MATSUNO Keita (Faculty of Veterinary Medicine, Hokkaido University)
The recent (re)emergence of tick-borne viruses has complicated the epidemiological landscape of tick-borne infectious diseases, posing a significant challenge to public health systems worldwide. In Japan, fatal cases of severe fever with thrombocytopenia syndrome virus (SFTSV) and tick-borne encephalitis virus infections were recently reported. However, to understand whole virus populations in ticks, the genetic diversity of viruses and/or low virus titers in ticks have hampered us. Thus, we have employed a comprehensive screening method to identify a variety of viral pathogens in ticks. By far, more than three-thousand ticks were collected in Japan (including approximately a hundred ticks collected in Amami-oshima and Tokunoshima islands), and a variety of viruses was discovered in various species of ticks. Phylogenetic analysis suggests that phleboviruses in ticks, including SFTSV, have co-evolved together with ticks. While our screening has not identified any viruses in the island ticks, monitoring on pathogens may need to be continued to prepare for the future emergence of tick-borne diseases.
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