Mbouombouo M, Ajeagah G, Ndjama J, Tchakala I, Gnon B, Enah D, Yogback G
Laboratoire d'hydrobiologie et environnement, Université de Yaoundé 1 BP 337 Yaoundé 1, Cameroun.
Institut de recherches géologiques et minières, BP 4110 Yaoundé, Cameroun.
Bull Soc Pathol Exot. 2019;112(2):61-70. doi: 10.3166/bspe-2019-0079.
In order to evaluate the abundance of oocysts in the Mezam watershed in Bamenda, Northwest Region of Cameroon, a study was carried out from January to June 2017. Samples were collected monthly from 13 stations within the watershed. The direct concentration method and the Ziehl-Neelsen technique were employed in the identification of these parasites. The physicochemical analysis showed that the water samples had a neutral pH (7.46±0.46), lowly mineralized (165.61±110.02μS/cm), moderately oxygenated (60.64 ± 17, 25%), present moderate organic pollution (2.85±2.49mg/l KMnO4). KMnO) and low levels of orthophosphate (1.8±1.88 mg/l PO) and nitrates (2.47±5.06 mg/l NO). Biological analysis revealed the presence of spp. (143.98±203.35 oocysts/l), (88.47 ± 123.19 oocysts/l), (141.31±143.19 oocysts/l) and (76 ± 111.04 oocysts/l). The highest densities of these parasites were recorded at the Mufueh stream, situated in the periurban area. Meanwhile, the lowest densities were found in the urban area (Formuki, Mankon, Ayaba and Mezam streams). The dry season showed higher densities of oocysts (471.42±216.32 oocysts /l). Statistical analysis revealed a significant correlation (P ≤ 0.05) between the density of the organisms and the physico-chemical parameters such as pH, oxidability, dissolved oxygen and nitrates. Respecting basic hygienic rules as well as treating water before use would reduce the risk of contamination of the population.
为了评估喀麦隆西北地区巴门达梅扎姆流域卵囊的丰度，于2017年1月至6月开展了一项研究。每月从该流域内的13个站点采集样本。采用直接浓缩法和齐尔-尼尔森技术鉴定这些寄生虫。理化分析表明，水样的pH值呈中性（7.46±0.46），矿化程度低（165.61±110.02μS/cm），含氧量适中（60.64 ± 17, 25%），存在中度有机污染（2.85±2.49mg/l KMnO₄），正磷酸盐（1.8±1.88 mg/l PO₄）和硝酸盐（2.47±5.06 mg/l NO₃）含量低。生物学分析显示存在 spp.（143.98±203.35个卵囊/升）、 （88.47 ± 123.19个卵囊/升）、 （141.31±143.19个卵囊/升）和 （76 ± 111.04个卵囊/升）。这些寄生虫的最高密度记录于位于城郊地区的穆富埃溪流。同时，最低密度出现在市区（福尔穆基、曼孔、阿亚巴和梅扎姆溪流）。旱季卵囊密度更高（471.42±216.32个卵囊/升）。统计分析表明，生物密度与pH值、氧化能力、溶解氧和硝酸盐等理化参数之间存在显著相关性（P ≤ 0.05）。遵守基本卫生规则以及在使用前对水进行处理将降低人群受污染的风险。
