Adult hookworms (Necator spp.) collected from researchers working with wild western lowland gorillas

0456428 - ÚBO 2017 RIV GB eng J - Journal Article
Kalousová, B. - Hasegawa, H. - Petrželková, Klára Judita - Sakamaki, T. - Kooriyma, T. - Modrý, D.
Adult hookworms (Necator spp.) collected from researchers working with wild western lowland gorillas.
Parasites & Vectors. Roč. 9, č. 75 (2016), č. článku 75. ISSN 1756-3305. E-ISSN 1756-3305
R&D Projects: GA ČR GA15-05180S
Institutional support: RVO:68081766
Keywords : Necator spp * Hookworm * Morphology * Human infection * Necator gorillae * Necator americanus
Subject RIV: FN - Epidemiology, Contagious Diseases ; Clinical Immunology
Impact factor: 3.035, year: 2016

In general, studies on the diversity of strongylid nematodes in endangered host species are complicated as material obtained by non-invasive sampling methods has limited value for generic and species identification. While egg morphology barely allows assignment to family, the morphology of cultivated infective third stage larvae provides a better resolution at the generic level but cannot be used for exact species identification. Morphology-based taxonomic approaches greatly depend on the examination of adult worms that are usually not available./nHookworm parasites in two European researchers, who participated in gorilla research in the Central African Republic, were expelled after anthelmintic treatment to the faeces, collected and morphologically examined. A male worm discharged naturally from a wild bonobo (Pan paniscus) in Congo was also examined for comparison./nTwo species of Necator were identified in researchers’ faecal material: Necator americanus (Stiles, 1902) and N. gorillae Noda & Yamada, 1964; the latter species differed in having a smaller body, smaller buccal cavity and shorter spicules with spade-shaped membranes situated distally. Males of N. gorillae also possessed unusual cuticular thickenings on the dorsal side of the prebursal region of the body. These characters, shared with the male worm from the bonobo, correspond well to the description of N. gorillae described from gorillas in Congo./nBased on the morphology of the hookworms recovered in this study and previous molecular analyses of larvae developed from both humans and western lowland gorillas (Gorilla gorilla gorilla) from this locality, we conclude that the researchers became infected with gorilla hookworms during their stay in the field. This is the first report of infection with a Necator species other than N. americanus in humans.
Permanent Link: http://hdl.handle.net/11104/0256960