每日一题_2022.12.02

A 26-year-old man presented to the outpatient clinic with a 1-month history of pain and swelling in the scrotum and low-grade fevers. On examination, there was swelling and tenderness of the right side of the scrotum. Laboratory studies showed peripheral eosinophilia. An ultrasound of the scrotum showed echogenic, linear structures moving within the lymphatic channels (arrowhead) adjacent to the epididymal head and testis (asterisk) — a finding known as “filarial dance sign.” What vector is responsible for transmitting the nematode causing this disease?

患者男，26岁，因阴囊疼痛、肿胀、低热1个月来门诊就诊。查体：阴囊右侧肿胀、压痛。实验室检查显示外周嗜酸性粒细胞增多。阴囊超声检查显示，在邻近附睾头和睾丸（星号）的淋巴通道（箭头）内有回声的线状结构移动——这一发现被称为“丝虫舞蹈征”。是什么媒介负责传播引起这种疾病的线虫？

A. Aquatic snail

B. Blackfly

C. Mosquito

D. Sandfly

E. Tsetse fly

答案解析：

正确的答案是蚊子。图像显示阴囊淋巴丝虫病，一种由蚊子传播的线虫引起的寄生虫感染。移动的回声结构代表了迁移到淋巴通道中的活蠕虫。当阴囊抽吸物光学显微镜鉴定班氏丝虫时确诊。口服乙胺嗪3周疗程后，患者症状减轻，第二次超声未见活动微丝蚴的证据。

正确答案：C