Current status of Ascaris lumbricoides infection in populations in Yunan Province, 2015

doi:10.12140/j.issn.1000-7423.2021.02.024

Abstract

Abstract:

To understand and analyze the infection status of Ascaris lumbricoides in Yunnan Province, a cross-sectional survey was conducted according to the National Survey Program and Implementation Details of Key Parasitic Diseases in 2015. Twenty sites of 10 counties (cities) were selected using the stratified cluster sampling method and stool samples were collected from no less than 250 permanent residents (≥ 1 year old) per site for microscopical examination using modified Kato-Katz thick smear method (two-reading/sample). A total of 5 067 participants were enrolled and 381 of them were infected with A. lumbricoides, with an overall prevalence of 7.5%. Among the 381 residents, the proportions of infection with unfertilized Ascaris eggs, fertilized Ascaris eggs and a mixture of both were 42.5%, 39.4% and 18.1%, respectively. The proportions of mild, moderate and heavy infections were 68.0%, 29.1% and 2.9%, respectively. Different detection rates were observed among different ecological regions, i.e., the eastern Tibet-western Sichuan region had the highest detection rate (16.6%, 211/1 271), in which the Gongshan County had the highest rate (26.2%, 200/762), and Ascaris infection was detected in all 10 counties of this region. There was a statistically significant difference in the detection rate among different ecological regions and counties (P < 0.01). The detection rate in females (8.2%, 218/2 645) was higher than that in males (6.7%, 163/2 422) (P > 0.05). All age groups were found with Ascaris infection, but the highest detection rate was found in children under 10 years (18.1%, 119/657) (P < 0.01). The Dulong ethnicity had the highest detection rate (48.9%, 131/268) among ethnic groups (P < 0.01). Teachers had an detection rate of (2/6), while the pre-school children had an infection rate of 21.4% (93/435). Among the examinees with different educational levels, the illiterate had the highest detection rate (13.1%, 177/1347) (P < 0.01). The detection rate of Ascaris lumbricoides in Yunnan Province showed significant differences with regard to age, ethnicity, occupation, and educational level (P < 0.01). Overall, the detection rate showed a differential distribution among regions, with particularly high rate and infection intensity in some areas.

Key words: Yunnan Province, Ascaris lumbricoides, detection rate, Survey

CLC Number:

R532.11

ZI Jin-rong, WANG Li-bo, YANG Ya-ming, LI Ben-fu, YAN Xin-liu, PENG Jia, CAI Xuan, WANG Zheng-qing, DU Zun-wei, WU Fang-wei. Current status of Ascaris lumbricoides infection in populations in Yunan Province, 2015[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2021, 39(2): 273-277.

Figures/Tables 3

References 17

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地区	检查人数	感染人数	感染检出率/%
藏东-川西生态区
贡山县	762	200	26.2
香格里拉县	509	11	2.2
小计	1 271	211	16.6
四川盆地生态区
威信县	501	45	9.0
永善县	763	51	6.7
小计	1 264	96	7.6
滇桂粤南部生态区
盈江县	257	29	11.3
河口县	516	2	0.4
麻栗坡县	505	32	6.3
小计	1 278	63	4.4
川西南-滇中北山地生态区
宁蒗县	252	1	0.4
永平县	500	8	1.6
通海县	502	2	0.4
小计	1 254	11	0.9
合计	5 067	381	7.5

特征	检查人数	感染人数	感染检出率/%
性别
男	2 422	163	6.7
女	2 645	218	8.2
年龄组/岁
< 10	657	119	18.1
10~19	466	33	7.1
20~29	511	41	8.0
30~39	774	58	7.5
40~49	1 028	33	3.2
50~59	711	47	6.6
60~69	507	31	6.1
≥ 70	413	19	4.6
职业
教师	6	2	2/6
学前儿童	435	93	21.4
干部	6	1	1/6
学生	618	51	8.3
农民	3 705	234	6.3
其他	297	0	0
民族
独龙族	268	131	48.9
景颇族	19	4	21.1
怒族	180	30	16.7
傈僳族	260	32	12.3
苗族	257	30	11.7
蒙古族	14	1	1/14
汉族	3 115	136	4.4
藏族	370	14	3.8
纳西族	39	1	2.6
彝族	137	2	1.5
其他	408	0	0
文化程度
文盲	1 347	177	13.1
小学	2 256	143	6.3
初中	1 255	51	4.1
高、中专	157	6	3.8
大专及以上	52	4	7.7