[1] As of 2021, Yezo virus was found in wild deer, raccoons, and ticks from Hokkaido, the northernmost island in Japan.

They were not found in Hokkaido raccoon dogs (Nyctereutes procyonoides albus) or rodents (Myodes rufocanus bedfordiae and Apodemus speciosus).

[1] In 2024, Yezo virus was also found in 0.5% of Ixodes persulcatus ticks in Inner Mongolia, Heilongjiang, and Jilin in Northeastern China.

[2] In 2019 and 2020 two patients in Hokkaido, Japan had an acute febrile illness with thrombocytopenia and leukopenia, lymphocytopenia, coagulation disorder, and increased levels of liver enzymes after a tick bite.

[1] In 2024, a younger person from China without underlying disease was described with a mild form of infection: light headache, dizziness, blurred vision, shortness of breath, fatigue, and arthralgia.