Soper D M, Raffel T R, Sckrabulis J P, Froelich K L, McPhail B A, Ostrowski M D, Reimink R L, Romano D, Rudko S P, Hanington P C
Department of Biology, University of Dallas, 1845 E. Northgate Dr, Irving, TX 75062, USA.
Department of Biological Sciences, Oakland University, 118 Library Dr, Rochester Hills, MI 48309, USA.
Parasitology. 2023 Jan;150(1):88-97. doi: 10.1017/S0031182022001561. Epub 2022 Nov 9.
Cercarial dermatitis (‘swimmer's itch’; SI), characterized by small itchy bumps caused by schistosome parasites of birds and mammals, is a common problem in Michigan. Research on avian schistosomes began nearly 100 years ago in Michigan inland lakes, yet scientists are still uncovering basic biological information including the identification of local snail and parasite species that cause SI. Previous research primarily focused on lakes in the northern half of Michigan's lower peninsula, although SI occurs throughout the state. We surveyed snails and snail-borne trematodes in lakes across Michigan's lower peninsula and used quantitative polymerase chain reaction analysis of filtered water samples to identify parasites to the species level, including a recently discovered parasite species that uses the snail as its intermediate host. Most SI mitigation efforts have focused on a parasite species hosted by the snail ( = ); however, lymnaeid snails and their associated schistosome species were largely restricted to northern lakes. In contrast, and its associated parasite species were common in both northern and southern Michigan lakes. A third schistosome species associated with physid snails was also present at low levels in both northern and southern lakes. These results indicate that the recently discovered parasite species and its planorbid snail intermediate host may be more important drivers of Michigan SI than previously thought, possibly due to increased definitive host abundance in recent decades. These results have potentially important implications for SI mitigation and control efforts.
尾蚴性皮炎(“游泳者瘙痒症”;SI),其特征为由鸟类和哺乳动物的血吸虫寄生虫引起的小瘙痒肿块,是密歇根州的一个常见问题。对鸟类血吸虫的研究始于近100年前密歇根州的内陆湖泊,但科学家们仍在揭示基本的生物学信息,包括确定导致SI的当地蜗牛和寄生虫物种。以前的研究主要集中在密歇根州下半岛北半部的湖泊,尽管SI在全州都有发生。我们对密歇根州下半岛的湖泊中的蜗牛和蜗牛传播的吸虫进行了调查,并对过滤后的水样进行定量聚合酶链反应分析,以将寄生虫鉴定到物种水平,包括最近发现的一种以该蜗牛为中间宿主的寄生虫物种。大多数减轻SI的努力都集中在由该蜗牛(= )宿主的一种寄生虫物种上;然而,椎实螺及其相关的血吸虫物种主要局限于北部湖泊。相比之下,和其相关的寄生虫物种在密歇根州北部和南部的湖泊中都很常见。与膀胱螺相关的第三种血吸虫物种在北部和南部湖泊中也都有低水平存在。这些结果表明,最近发现的寄生虫物种及其平卷螺中间宿主可能是密歇根州SI比以前认为的更重要的驱动因素,可能是由于近几十年来终末宿主数量增加。这些结果对减轻和控制SI的努力可能具有重要意义。