1/5. Zoonotic onchocerciasis caused by a parasite from wild boar in Oita, japan. A comprehensive analysis of morphological characteristics of the worms for its diagnosis.Histological examination of a nodule removed from the back of the hand of a 58-year-old woman from Oita, Kyushu, japan showed an Onchocerca female sectioned through the posterior region of the worm (ovaries identifiable) and young (thin cuticle). Six Onchocerca species are enzootic in that area: O. gutturosa and O. lienalis in cattle, O. suzukii in serows (Capricornis crispus), O. skrjabini and an Onchocerca sp. in Cervus nippon nippon, and O. dewittei japonica in wild boar (sus scrofa leucomystax). Diagnostic characters of female Onchocerca species, such as the cuticle and its ridges, change along the body length. tables of the histologic morphology of the mid- and posterior body-regions of the local species are presented. In addition, it was observed that transverse ridges arose and thickened during the adult stage (examination of fourth stage and juvenile females of O. volvulus). The specimen described in this report, with its prominent and widely spaced ridges, was identified as O. d. japonica. Four of the 10 zoonotic cases of onchocerciasis reported worldwide were from Oita, three of them being caused by O. d. japonica, the prevalence of which in local wild boar was 22 of 24 (92%).- - - - - - - - - - ranking = 1keywords = ridge (Clic here for more details about this article) |
2/5. An Onchocerca species of wild boar found in the subcutaneous nodule of a resident of Oita, japan.Histological examination and dissection of a subcutaneous nodule removed from the right infraclavicular region of a 69-year-old woman from Oita, Kyushu, japan, revealed a young female of Onchocerca dewittei japonica, a common parasite of wild boar in the Oita region. Distinctive morphologic characteristics of this Onchocerca species include the thick cuticle with very prominent and straight transverse ridges overlapping at the lateral sides, the lack of inner striae (scalloping) of the inner cuticle layer, the dorso-ventral symmetry, and the thick somatic muscles. Jointed with previous reports in the past decade, this case confirms the occasional transmission of the parasite from wild boar to humans in Oita.- - - - - - - - - - ranking = 0.33333333333333keywords = ridge (Clic here for more details about this article) |
3/5. A human case of zoonotic onchocerciasis in japan.A 2-year-old girl living in southwestern japan had a nodule of 2 months' duration on the left foot. A biopsy from the lesion showed transverse sections of a worm surrounded by granulomatous tissue. The worm was identified as an Onchocerca sp. from the morphological characteristics such as relatively thick cuticles, annular ridges on the cortical layer, and high somatic muscles. Positive serological tests using ELISA for Onchocerca gutturosa and onchocerca volvulus supported the diagnosis. This was the first case of zoonotic Onchocerca infection detected in japan. The clinicopathological aspects of zoonotic onchocerciasis of this case were discussed.- - - - - - - - - - ranking = 0.33333333333333keywords = ridge (Clic here for more details about this article) |
4/5. Second case of zoonotic Onchocerca infection in a resident of Oita in japan.A non-gravid female Onchocerca was found in histopathological sections of a biopsy specimen taken from a painful nodule in the wrist of a 57-year old woman in Oita, in southern japan. Six species of Onchocerca have been found in animals in japan: two in wild bovids, one in equids, and three in domestic bovids of which one, Onchocerca sp., is only known by the microfilaria and infective stage. Distinctive morphological features of the worm, including a three-layered thick cuticle with prominent annular ridges at wide intervals, high somatic muscles and narrow lateral chords, resembled those of O. gutturosa, one of the three bovine Onchocerca species transmitted in the Oita region. However Onchocerca sp., which is also transmitted in this region, cannot be excluded. An ELISA test of the patient serum suggests that infections by Onchocerca spp. might be distinguished from those by dirofilaria immitis, of which the number of human cases is increasing in japan.- - - - - - - - - - ranking = 0.33333333333333keywords = ridge (Clic here for more details about this article) |
5/5. Subcutaneous nodules as a manifestation of onchocerciasis. A rare condition in the united states.Although infection with tissue nematodes is a significant health problem in many parts of the world, such cases are unusual in the continental united states. This report describes a case of onchocerca volvulus infection, acquired by a 38-year-old female missionary in northern brazil, that manifested as subcutaneous nodules in the groin and flank two years after the patient's return to the united states. A year previously, a wrong diagnosis of wuchereria bancrofti was made at biopsy. At that time, treatment with diethylcarbamazine citrate had to be discontinued because of intense pruritus. Examination of a wet saline impression smear of a new biopsy specimen showed the adult worms to have regularly arranged outer annular ridges, which, together with the pruritus after treatment with diethylcarbamazine (a positive Mazzotti test), led to the diagnosis of onchocerciasis. retreatment with diethylcarbamazine again caused pruritus, but this was tolerated as were subsequent treatments.- - - - - - - - - - ranking = 0.33333333333333keywords = ridge (Clic here for more details about this article) |