Division of Vector-Borne Disease, Centers for Disease Control and Prevention, Fort Collins, Colorado.
Am J Trop Med Hyg. 2013 Oct;89(4):784-7. doi: 10.4269/ajtmh.13-0138. Epub 2013 Aug 12.
Laboratory-reared Oropsylla montana were exposed to soil and wild-caught Oropsylla montana feces for 1 week. Fleas from these two treatments and a control group of laboratory-reared fleas were infected with Yersinia pestis, the etiological agent of plague. Fleas exposed to soil transmitted Y. pestis to mice at a significantly greater rate (50.0% of mice were infected) than control fleas (23.3% of mice were infected). Although the concentration of Y. pestis in fleas did not differ among treatments, the minimum transmission efficiency of fleas from the soil and wild flea feces treatments (6.9% and 7.6%, respectively) were more than three times higher than in control fleas (2.2%). Our results suggest that exposing laboratory-reared fleas to diverse microbes alters transmission of Y. pestis.
实验室饲养的玉山恙螨接触土壤和野外采集的玉山恙螨粪便 1 周。来自这两种处理和对照组实验室饲养的跳蚤感染了鼠疫耶尔森菌，鼠疫的病原体。与对照组跳蚤（感染率为 23.3%）相比，接触土壤的跳蚤将鼠疫耶尔森菌传播给老鼠的速度明显更快（50.0%的老鼠被感染）。尽管三种处理方式的跳蚤中鼠疫耶尔森菌的浓度没有差异，但来自土壤和野生跳蚤粪便处理的跳蚤的最小传播效率（分别为 6.9%和 7.6%）比对照组的跳蚤（2.2%）高三倍以上。我们的研究结果表明，将实验室饲养的跳蚤暴露于不同的微生物会改变鼠疫耶尔森菌的传播。
