Peng W, Zhou X, Cui X, Crompton D W, Whitehead R R, Xiong J, Wu H, Peng J, Yang Y, Wu X, Xu K, Yan Y
Department of Parasitology, Jiangxi Medical College, Nanchang, P.R. China.
Parasitology. 1996 Dec;113 ( Pt 6):545-57. doi: 10.1017/s0031182000067597.
A longitudinal investigation on natural populations of Ascaris in humans and pigs and an investigation of soil contamination with Ascaris eggs were carried out from June 1993 to June 1994 in 2 villages, Manhu area, Xinjian County, Jiangxi Province, China. Results from these studies indicate that although human ascariasis is endemic there is significant fluctuation in both prevalence and the mean number of eggs/g faeces (epg) of the communities. Fluctuation of age-stratified prevalence and mean epg was detected in children but not in most adult groups. Most cases of human ascariasis were judged to involve low intensities of infection and a typical overdispersion distribution pattern was observed through the year. It was estimated that during the year, nearly half of the eggs discharged in the environment came from infections in children aged between 2 and 15 years which accounted for about 30% of the total population. Soil in and around houses and in vegetable gardens was found to be contaminated by Ascaris eggs and this situation remained relatively stable throughout the year. Monthly developmental rate of Ascaris eggs in soil was detected and the results suggest that the fluctuation in prevalence observed during the year should be directly attributed to the effect of seasonality of egg development. Features of Ascaris infection in pigs were found to be similar to those in humans except for a lower mean intensity of infection. The possibility of cross-infection of Ascaris between human and pig hosts is discussed.
1993年6月至1994年6月，在中国江西省新建县满湖地区的2个村庄，对人类和猪体内蛔虫的自然种群进行了纵向调查，并对土壤中蛔虫卵的污染情况进行了调查。这些研究结果表明，尽管人体蛔虫病是地方性疾病，但社区的患病率和每克粪便中虫卵的平均数量（epg）都有显著波动。在儿童中检测到年龄分层患病率和平均epg的波动，但在大多数成年组中未检测到。大多数人体蛔虫病病例被判定为感染强度较低，并且全年观察到典型的过度分散分布模式。据估计，在这一年中，环境中排出的虫卵近一半来自2至15岁儿童的感染，这些儿童约占总人口的30%。发现房屋内外和菜园中的土壤被蛔虫卵污染，并且这种情况全年保持相对稳定。检测了土壤中蛔虫卵的月度发育率，结果表明，全年观察到的患病率波动应直接归因于虫卵发育季节性的影响。发现猪蛔虫感染的特征与人类相似，但平均感染强度较低。讨论了人类和猪宿主之间蛔虫交叉感染的可能性。
