Setaria labiatopapillosa (Filarioidea, Nematoda) in Moroccan cattle: atypical localization and morphological characteriz
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HELMINTHOLOGY - ORIGINAL PAPER
Setaria labiatopapillosa (Filarioidea, Nematoda) in Moroccan cattle: atypical localization and morphological characterization of females and microfilariae by light and scanning electron microscopy Redouan Mrifag 1 & Mohamed Aly Lemrabott 1,2,3 & Khadija El Kharrim 1 & Driss Belghyti 1 & Leonardo K. Basco 2,3 Received: 29 June 2020 / Accepted: 3 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Filarioid nematodes are parasites of the tissues and tissue spaces of all vertebrates except fish. Females produce microfilariae that enter the host’s blood circulation or skin and may cause ocular and neurological pathology, leading to important implications in veterinary and public health. The present work is the first investigation on Setaria labiatopapillosa conducted in Morocco to characterize the morphological features of both adult and microfilaria forms. Two adult female nematodes were found free in the thoracic cavity of a slaughtered 3.5-year-old (6 teeth) Moroccan enhanced cross-breed bull which was born and raised in Morocco. The worms were identified as S. labiatopapillosa by light microscope (LM) and scanning electron microscopy (SEM) on the basis of their characteristic features of the anterior and posterior parts of the worms. The two S. labiatopapillosa worms measured 90 mm and 105 mm in length and 0.55 and 0.64 mm in width, respectively. Microfilariae were detected in the fully developed eggs contained in the uterus of both nematodes. A detailed morphology of both the adult females and larvae of S. labiatopapillosa is described using LM and SEM. Although the origin of S. labiatopapillosa analyzed in the present study is unknown and there is currently no evidence that Setaria spp. have invaded Morocco, further surveillance is warranted to determine the incidence of setariasis, identify its vectors, and take appropriate measures to protect the livestock and cattle industry of the country. Keywords Blood . Cattle . Filaria . Microfilariae . Microscopy . Morocco
Introduction Setaria spp. (Filarioidea, Nematoda) are vector-borne filarial nematodes transmitted through the bites of mosquitoes (Aedes, Anopheles, Culex, and Mansonia) and flies (Haematobia stimulans) (Azari-Hamidian et al. 2019). The Section Editor: Abdul Jabbar * Leonardo K. Basco [email protected]; [email protected] 1
Environment and Health Team, Laboratory of Environment and Biotechnology, Faculty of sciences, University Ibn Tofaïl, BP 133, 14000 Kenitra, Morocco
2
Institut de Recherche pour le Développement, Assistance Publique – Hôpitaux de Marseille, Service de Santé des Armées, Unité Mixte de Recherche Vecteurs – Infections Tropicales et Méditerranéennes (VITROME), Aix-Marseille Université, Marseille, France
3
Institut Hospitalo-Universitaire – Méditerranée Infection, 19-21 Boulevard Jean Moulin, 13005 Marseille, France
mature adult roundworms measure between 5 and 10 cm and dwell primarily in the abdominal cavity of domesticated ungulates, such as cattle, camels, hors
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