The claim
「大阪万博にマラリア蚊など様々なウィルスを持った蚊が撒き散らされた」?
Original review summary
The review says the insects reported at the Osaka Expo were chironomid midges, not mosquitoes. It cites an expert who identified the sampled insects as chironomids and said they do not bite people or pose a significant risk of transmitting disease; therefore, the claim that malaria or other viruses were being spread at the Expo is unsupported. [S1][S1]
Additional context
The review reports that an expert examined 15–16 insects provided by the Expo and identified all of them as shiou-yusurika. [S1] [S1]
Research date:
Sources and attribution
- [S1] 日本ファクトチェックセンター(JFC) original review
Original review · Retrieved October 16, 2026