<i>Onchocerca raillieti</i> n.sp. (Filarioidea) chez l'Ane domestique en Afrique

Bain, O.; Müller, R.; Khamis, Y.; Guilhon, Jean; Veen, TW Schillhorn van

doi:10.1017/s0022149x00026730

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…stands in contrast to those six species with an esophagus longer than 2,000 µm and with thicker posterior glandular part, in female and male, and vulva not far from head (twice the distance from the head to nerve ring). These species are O. raillieti Bain, Muller, Khamis, Guilhon & Schillhorn Van Veen, 1976, O. reticulata Diesing, 1841, and O. cervicalis Railliet & Henry, 1910O. flexuosa (Wedl, 1856) (Bain, 1981) is shown as apart from these species because the vulva is slightly less anterior], has similar esophageal morphology.…”

Section: Taxonomic Discussionmentioning

confidence: 99%

Onchocerca eberhardin. sp. (Nematoda: Filarioidea) from sika deer in Japan; relationships between species parasitic in cervids and bovids in the Holarctic region

Uni

Bain²,

Agatsuma

et al. 2007

Parasite

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Summary :Onchocerca eberhardi n. sp. from the sika deer, Cervus nippon, in Japan is described. Adult worms lived in the carpal ligament; infection reached high levels (up to 25 female and 16 male worms in a single carpal limb). Skin dwelling microfilariae were mainly found in the ears. Prevalence of infection was 81 % at the type locality, Mt. Sobo, in Kyushu. The new material was compared to the 31 species of Onchocerca presently known. Onchocerca eberhardi n. sp. females were characterized by a long slender anterior end and a thin esophagus ≤ 1 mm long with no or only a slight glandular region. The vulva was located near the level of the mid-esophagus and the cuticle had transverse external ridges and internal striae (two striae between adjoining ridges). The most similar species were O. stilesi (re-examined), O. lienalis, and to a lesser extent O. gutturosa, all from bovids (cattle). Two main lineages of Onchocerca are recognized in cervids with either primitive or with derived characteristics (as exemplified by the new species). The species in both lineages are not restricted to cervids but are also found in bovids in the Holarctic region, suggesting that the species diversified in the two host groups simultaneously, when these host groups lived in the same geographic area. Résumé

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Section: Taxonomic Discussionmentioning

confidence: 99%

Onchocerca eberhardin. sp. (Nematoda: Filarioidea) from sika deer in Japan; relationships between species parasitic in cervids and bovids in the Holarctic region

Uni

Bain²,

Agatsuma

et al. 2007

Parasite

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“…in the donkey. In the 20 animals we examined and in the several Sudanese donkeys examined by EL SAMMANI (1981) adult 0. raillieti occurred only in the ligamentum nuchae, a location different from its predilection sites as described by BAIN et al (1976) and a site occupied by 0. cervicalis in equines (MELLOR, 1973). 0. raillieti seems to replace O. cervicalis in Sudanese donkeys and possibly also in Sudanese horses as several autopsied by one of us ( H.S.H.)…”

Section: Skin Distribution Ofo Raillieti Mffmentioning

confidence: 69%

“…Onchocerca raillieti was recently described by BAIN et al (1976) from the penis and connective tissues of the flanks of donkeys, on the basis of material collected from various localities. BAIN et al (1976) also briefly described the microfilaria (mf) of this worm, but the distribution of the microfilariae (mff) in the skin of infected donkeys is yet to be determined.…”

Section: Introductionmentioning

confidence: 99%

Onchocerca raillieti: adult location and skin distribution of the microfilaria in Sudanese donkeys

Sammani

Hussein

1983

J. Helminthol.

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Onchocerca raillieti is the only Onchocerca species infecting Sudanese donkeys; it occurs only in the ligamentum nuchae, especially in the lamellar part of the ligament. The morphological features of both uterine and skin microfilariae were determined. Skin microrilariae are shorter than uterine ones and tend to accumulate in the regions of Linea alba and withers of infected donkeys. The possible identity of the vector of this worm in the Sudan is discussed.

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“…The two Onchocerca species infecting donkeys in Europe are O. cervicalis and O. reticulata, which are both found worldwide (1). The geographical range of O. raillieti infection in donkeys known to date is restricted to some countries in Africa (3,5,8). In previous studies, when the occurrence of O. cervicalis and O. reticulata was investigated concurrently, O. cervicalis was more prevalent than O. reticulata.…”

Section: Discussionmentioning

confidence: 98%

“…However, with the exception of a relatively recent case report in Italy ( 7 ), all these studies are dated. Moreover, only a limited number of studies have investigated the parasitosis in donkeys, almost all of the published studies in donkeys were from African countries, and most focus on O. raillieti ( 3 , 5 , 8 – 10 ). Currently, little or nothing is known about the current spread of Onchocerca infections in donkeys in Italy.…”

Section: Introductionmentioning

confidence: 99%

Incidental Detection of Onchocerca Microfilariae in Donkeys (Equus asinus) in Italy: Report of Four Cases

2020

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This paper reports the occurrence for the first time in Italy of autochthonous Onchocerca infection in donkeys. Four jennies, bred on the same farm, were referred to the Veterinary Teaching Hospital of Pisa for a checkup on ovarian activity (n = 3) or for veterinary support during the delivery (n = 1). Microfilariae were incidentally detected during the blood smear examination of one jenny. Peripheral blood samples were then collected from the other three jennies and the presence of microfilariae was investigated by Knott's test. Circulating unsheathed microfilariae were identified in all the animals. The level of microfilaraemia was between 1 and 31 microfilariae in 2 mL of blood. Hematological changes showed moderate eosinophilia in one case or both remarkable eosinophilia and basophilia in another case. Based on molecular findings by PCR and sequencing, the microfilariae showed 98% sequence similarity with Onchocerca sp. in the NCBI GenBank database (Accession No.: MK541848.1). The present report provides evidence that Onchocerca is an etiological agent of parasitic infection in donkeys in Italy. Our findings highlight the importance of screening in donkeys for Onchocerca even in the absence of clinical indications.

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Onchocerca raillieti n.sp. (Filarioidea) chez l'Ane domestique en Afrique

Cited by 9 publications

References 2 publications

Onchocerca eberhardin. sp. (Nematoda: Filarioidea) from sika deer in Japan; relationships between species parasitic in cervids and bovids in the Holarctic region

Onchocerca eberhardin. sp. (Nematoda: Filarioidea) from sika deer in Japan; relationships between species parasitic in cervids and bovids in the Holarctic region

Onchocerca raillieti: adult location and skin distribution of the microfilaria in Sudanese donkeys

Incidental Detection of Onchocerca Microfilariae in Donkeys (Equus asinus) in Italy: Report of Four Cases

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