The black fly, Simulium chumpornense Takaoka & Kuvangkadilok, is suspected to be a natural vector of Leucocytozoon. In this study, seasonal variation in abundance of the adult fly and molecular detection of Leucocytozoon in S. chumpornense and in domestic chicken was investigated in northeastern Thailand. A total of 10,416 female adults were obtained by monthly collection for one year at six sampling sites. There was a peak of abundance in the dry season (March – May) when more than 74% of the specimens were collected. An increased number of suitable habitats for immature stages during the dry season is potentially a factor driving dry season abundance. Molecular genetic investigations revealed that S. chumpornense harbored the infectious stage of Leucocytozoon sp. indicating that it is a natural vector of this parasite. Blood smear screening for the parasite in domestic chickens found a considerable prevalence (52%) of Leucocytozoon spp. infections. The cytochrome b sequences of this parasite in domestic chickens comprised two lineages. One lineage was closely related to Leucocytozoon sp. found in S. chumpornense and another matched with L. schoutedeni. Therefore, S. chumpornense is a vector of Leucocytozoon sp. while L. schoutedeni is possibly transmitted by other ornithophilic black fly species.

黑蝇，蚋chumpornense高冈与Kuvangkadilok，被怀疑的天然载体住白细胞。在这项研究中，纷纷成年果蝇和分子检测的季节变化住白细胞在S. chumpornense和家鸡在泰国东北部的影响。在六个采样点，通过每月采集一年共获得10,416名女性成年人。在干旱季节（3月至5月），采集了超过74％的标本，出现了丰度峰值。干旱季节未成熟阶段的合适栖息地数量增加可能是导致干旱季节丰度的一个因素。分子遗传学研究表明猪链球菌带有Leucocytozoon sp。的感染期。表明它是该寄生虫的天然载体。对家禽中的寄生虫进行血液涂片筛查发现，白细胞细小虫占相当比例（52％）。感染。家禽中该寄生虫的细胞色素b序列包含两个谱系。一种谱系与白细胞增生菌密切相关。在chumpornense中发现，另一个与schoutedeni匹配。因此，猪链球菌是白细胞增生菌sp。的载体。而L. schoutedeni可能是由其他嗜鸟黑蝇种传输。