Seasonal Variation and Factors Affecting Trypanosoma theileri Infection in Wild Sika Deer (Ezo Sika Deer Cervus nippon yesoensis) in Eastern Hokkaido

北海道东部野生梅花鹿（虾夷梅花鹿 Cervus nippon yesoensis）锥虫病感染的季节变化及影响因素