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在欧亚獾()和硬蜱科()中,意大利。

() in Eurasian badgers () and Ixodidae ticks, Italy.

机构信息

Department of Veterinary Medicine, University of Bari, 70010Valenzano, Italy.

Osservatorio Faunistico Regionale della Puglia, 70020Bitetto, Italy.

出版信息

Parasitology. 2021 Oct;148(12):1516-1521. doi: 10.1017/S0031182021001190. Epub 2021 Jul 5.

Abstract

Trypanosomes are haemoflagellate protozoa transmitted by blood-feeding arthropods causing infections in a wide range of mammals, including humans. Adult badgers (Meles meles, n = 2), displaying severe paralysis, ataxia and severe ectoparasite infestation, were rescued from a peri-urban area of Bari (southern Italy). Blood samples and ectoparasites were screened for Trypanosoma spp. by the combined PCR/sequencing approach, targeting a fragment of 18S rRNA gene. Smears of haemolymph, guts and salivary glands of the alive ticks were microscopically observed. No haematological alterations, except thrombocytopenia, were found. Trypomastigotes and epimastigotes were observed in the blood smears of both badgers and Trypanosoma pestanai was molecularly identified. Out of 33 ticks (i.e. n = 31 Ixodes canisuga, n = 2 Ixodes ricinus) and two fleas (Ctenocephalides felis), 11 specimens (n = 5 I. canisuga engorged nymphs, n = 4 engorged females and n = 2 I. ricinus engorged females) tested positive only for T. pestanai DNA. All smears from ticks were negative. The present study firstly revealed T. pestanai in Ixodidae and badgers from Italy, demonstrating the occurrence of the protozoan on the peninsula. Further studies are needed to clarify the occurrence of the only known vector of this parasite, Paraceras melis flea, as well as other putative arthropods involved in the transmission of T. pestanai.

摘要

锥虫是血鞭毛原生动物,通过吸血节肢动物传播,可感染包括人类在内的广泛哺乳动物。两只(Meles meles,n=2)成年獾因严重瘫痪、共济失调和严重外寄生虫感染,从意大利南部巴里的城郊地区被解救。通过针对 18S rRNA 基因片段的组合 PCR/测序方法,对血液样本和外寄生虫进行了锥虫属 spp. 的筛查。对活着的蜱虫的血淋巴、肠道和唾液腺涂片进行了显微镜观察。除血小板减少症外,未发现血液学改变。在两只獾的血液涂片和分子鉴定的锥虫 pestanai 中观察到锥虫和锥鞭毛体。在 33 只蜱虫(即 n=31 Ixodes canisuga、n=2 Ixodes ricinus)和两只跳蚤(Ctenocephalides felis)中,11 个标本(n=5 只 I. canisuga 饱血若虫、n=4 只饱血雌蜱和 n=2 只 I. ricinus 饱血雌蜱)仅对 T. pestanai DNA 呈阳性。所有来自蜱虫的涂片均为阴性。本研究首次在意大利的蜱科和獾中发现了 T. pestanai,证明了这种原生动物在半岛上的存在。需要进一步的研究来阐明唯一已知的这种寄生虫的载体——Paraceras melis 跳蚤,以及其他可能参与传播 T. pestanai 的节肢动物的存在情况。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3a26/11010210/d1741c9d8928/S0031182021001190_figAb.jpg

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