Survey of soil-transmitted nematode infection in Hangzhou from 2015 to 2018

doi:10.12140/j.issn.1000-7423.2019.05.019

Abstract

Abstract:

To understand the prevalence of soil-transmitted nematode (STN) infection in Zhejiang Province, a survey was carried out in Jiande city, a fixed monitoring site and in Xiaoshan, Fuyang, Linan Districts, Tonglu, Chun’an Counties, the five mobile monitoring sites of STN infections from 2015 to 2018 according to the requirements of Zhejiang Surveillance Plan and Implementing Approaches of STN. A total of 7 911 residents were enrolled in the survey, 145 of them were positive for STN infections and the infection rate was 1.83%. Among them, 4 cases were infected with Ascaris lumbricoides and Truchuris trichiura, and 137 cases were infected with hookworm. Enterobius vermicularis was not detected. The overall prevalence of STN decreased from 2.32% (89/3 829) in 2015 to 0.54% (11/2 044) in 2018, with a decrease rate of 76.72%. Hookworm larvae were cultured from 137 hookworm egg positive feces using test-tube filter paper culture method, 98 of them were larva-positive (71.53%). In which 80 cases were infected with Necator americanus, 13 cases with Ancylostoma duodenale and 5 cases were fixed infections. The infection rates of STN for male and female were 2.00% (77/3 845) and 1.67% (68/4 066), respectively. The highest infection rate was 3.20% (101/3 156) in the age group over 60, and the infection rate increased with age (χ² = 63.061, P < 0.01). With respect of education and occupational distribution, the highest prevalence of STN infection was found in students in junior middle school (2.07%, 48/2 313) and in farmers (2.13%, 144/6 763). Among 100 examined soil samples, the detection rate of A. lumbricoides eggs was 2.00% (2/100), and no hookworm larva was detected. From 2015 to 2018, the infection rate of STN in monitoring sites in Hangzhou showed a downward trend.

Key words: Soil-transmitted nematode, Investigation, Analysis

CLC Number:

R532.1

Xing-yi JIN, Su-juan ZHU, Wei-min XU, Wei-qiang WANG, Heng WANG, Yi TANG, Liang-liang HUO, Yang YANG. Survey of soil-transmitted nematode infection in Hangzhou from 2015 to 2018[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2019, 37(5): 608-611.

年份	调查人数	感染人数	感染率/%	蛔虫		钩虫		鞭虫
年份	调查人数	感染人数	感染率/%	感染人数	感染率/%	感染人数	感染率/%	感数人数	感染率/%
2015	3 829	89	2.32	4	0.10	82	2.11	3	0.08
2016	1 028	18	1.75	0	0	17	1.65	1	0.10
2017	1 010	27	2.67	0	0	27	2.67	0	0
2018	2 044	11	0.54	0	0	11	0.54	0	0

年份	镜检阳性数	培养阳性数	美洲钩虫		十二指肠钩虫		混合感染
年份	镜检阳性数	培养阳性数	感染人数	构成比/%	感染人数	构成比/%	感染人数	构成比/%
2015	82	49	43	87.76	6	12.24	0	0
2016	17	15	10	66.67	5	33.33	0	0
2017	27	23	20	86.96	2	8.69	1	4.35
2018	11	11	7	63.64	0	0	4	36.36

特征	检查人数	感染人数	感染率/%	蛔虫		鞭虫		钩虫
特征	检查人数	感染人数	感染率/%	感染人数	感染率/%	感染人数	感染率/%	感染人数	感染率/%
性别
男	3 845	77	2.00	2	0.05	1	0.02	74	1.92
女	4 066	68	1.67	2	0.05	3	0.07	63	1.54
年龄组/岁
< 40	1 306	1	0.08	1	0	0	0	1	0.10
40~60	3 449	43	1.25	3	0.09	2	0.06	38	1.10
> 60	3 156	101	3.20	0	0	2	0.06	99	3.14
职业
学龄前儿童及学生	645	1	0.16	0	0	0	0	1	0.16
农民	6 763	144	2.13	4	0.06	4	0.06	136	2.01
其他职业	503	0	0	0	0	0	0	0	0
文化程度
文盲	1 066	19	1.78	0	0	1	0.09	18	1.68
小学	3 599	70	1.94	0	0	3	0.08	67	1.86
初中	2 313	48	2.07	3	0.13	0	0	45	1.94
高中及以上	933	8	0.85	1	0.11	0	0	7	0.75
监测点
固定点	3 802	102	2.68	0	0	1	0.03	101	2.66
流动点	4 109	43	1.05	4	0.09	3	0.09	36	0.87
合计	7 911	145	1.83	4	0.05	4	0.05	137	1.73

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Survey of soil-transmitted nematode infection in Hangzhou from 2015 to 2018

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