Etewa Samia E, Abdel-Rahman Sara A, Abd El-Aal Naglaa F, Fathy Ghada M, El-Shafey Mahmoud A, Ewis A M G
Medical Parasitological Department, Faculty of Medicine, Zagazig University, Sharkyia, Egypt.
Clinical Pathology Department, Faculty of Medicine, Zagazig University, Sharkyia, Egypt.
J Parasit Dis. 2016 Jun;40(2):496-504. doi: 10.1007/s12639-014-0532-5. Epub 2014 Aug 31.
Soil-transmitted helminths are mainly a group of parasitic nematodes causing human infection through contact with parasite eggs or larvae; they survive in the warm and moist soil of the tropical and subtropical countries. This study was carried out in Sharkyia governorate from October, 2011 to October, 2013, to correlate between the prevalence and distribution of these parasites in the soil and the physicochemical factors affecting the examined samples of the soil. One hundred and twenty samples of different types of soil (clay, silt, sand) from different localities were collected and examined. Diagnosis of geohelminths was confirmed by the recovery of their eggs and larvae with other protozoa by different parasitological methods. The modified baermann method was found to be more efficient in detection of geohelminths larvae than charcoal culture method. Among the examined sites geohelminths were much more numerous in the soil of rural areas especially in the spring and summer seasons, while the contamination of canal banks by geohelminths was the worst (80 %). An insignificant correlation was reported between the soil texture and the number of positive samples in the examined areas while the relationship was directly proportional among (moisture, PH, organic). It appeared that the most common geohelminthic stage was Toxocara spp. eggs besides other types of protozoa especially Balantidium coli cysts. This suggests that factors other than soil texture are important in the prevalence of geohelminths in the soil e.g. temperature, moisture, PH and organic matter. So, to change some of these factors in a trial to control geoparasites transmission but with keeping the environment should be tried. These results also open the way to further studies to highlight the mutual affection between inhabitants of these sites and the prevalence of these geoparasites.
土源性蠕虫主要是一类寄生线虫，通过接触寄生虫卵或幼虫导致人类感染；它们在热带和亚热带国家温暖潮湿的土壤中生存。本研究于2011年10月至2013年10月在谢克希亚省开展，旨在关联这些寄生虫在土壤中的流行率和分布情况与影响所检测土壤样本的理化因素。收集并检测了来自不同地点的120份不同类型土壤（粘土、粉砂、砂土）样本。通过不同的寄生虫学方法，从土壤中检出土源性蠕虫的卵和幼虫以及其他原生动物，从而确诊土源性蠕虫感染。结果发现，改良贝曼法在检测土源性蠕虫幼虫方面比活性炭培养法更有效。在所检测的地点中，农村地区土壤中的土源性蠕虫数量更多，尤其是在春季和夏季，而运河岸边的土源性蠕虫污染最为严重（80%）。在所检测区域，土壤质地与阳性样本数量之间的相关性不显著，而（湿度、pH值、有机物）之间的关系呈正比。似乎最常见的土源性蠕虫阶段是弓蛔虫属虫卵，此外还有其他类型的原生动物，尤其是结肠小袋纤毛虫包囊。这表明，除土壤质地外，其他因素在土壤中土源性蠕虫的流行中也很重要，例如温度、湿度、pH值和有机物。因此，应尝试改变其中一些因素以控制土源性寄生虫的传播，但要保持环境不变。这些结果也为进一步研究开辟了道路，以突出这些地点的居民与这些土源性寄生虫流行之间的相互影响。
