Prevalence of human soil-transmitted helminth infections in rural areas of Guizhou Province in 2015

doi:10.12140/j.issn.1000-7423.2019.06.009

Abstract

Abstract:

Objective To investigate the infection status of human soil-transmitted helminths (STH) in rural areas of Guizhou Province so as to provide scientific basis for formulating the prevention and control measures for these diseases in the province. Methods The study was performed according to the National Survey Program and Implementation Rules for the Status of Human Key Parasites in 2015. Total 30 survey sites were selected from 12 counties (cities or districts) based on the stratified cluster random sampling method. No less than 250 permanent villagers in each site were enrolled in the survey. The fecal samples were collected from each participant and the eggs of STHs (Ascaris lumbricoides, hookworm, whipworm and Enterobius vermicularis) were examined under microscope using Kato-Katz technique. The eggs of E. vermicularis were examined using transparent adhesive tape around anuses of children with age of 3-6 years old. Results A total of 7 572 residents were investigated with STH infection rate of 14.9% (1 127/7 572). The infection rates of A. lumbricoides, whipworm, hookworm, and E. vermicularis were 8.1% (614/7 572), 2.2% (163/7 572), 6.3% (477/7 572) and 0.3% (21/7 572), respectively. Among the 12 counties surveyed, the infection rate of STH in Zhenfeng County was the highest (30.8%, 160/519), while that in Sinan County was the lowest (5.2%, 13/250), with statistical significance in different counties (P < 0.01). The infection rate of STH in males was 12.6% (472/3 756), which is lower than that in females (17.2%, 655/3 816) with statistical difference (P < 0.01). The STH infections were found in all age groups with the highest infection rate in the age group over 70 years old (21.0%, 111/528). Farmers as well as herdsmen and fishermen, possessed the highest infection rate of 15.8% (780/4 946) compared with people with other occupations. People in Gelao ethnic group owned higher STH infection rate of 22.9% (63/275) than people with other ethnic groups. In terms of education, the STH infection rate was highest among illiterate residents (18.9%, 214/1 133). There was statistical difference in infection rates among the residents with different age groups, occupations, nationalities and education levels (P < 0.01). Conclusion A. lumbricoides and hookworm are the main soil-transmitted helminths that infect people in rural areas of Guizhou Province. There are obvious regional distribution. Female with age over 70, farmers including hersman and fisherman, Gelao minority ethnic group and illiterate people are the main population with high infection and therefore the major control targets.

Key words: Soil-transmitted helminth, Infection, Investigation, Guizhou Province

CLC Number:

R532.1

ZHU Ai-ya, YAO Dan-cheng, LI An-mei, DAI Jia-rui, LI Yang, HUANG Yu-ting, SHI Wei-fang, SHE Dan-ya. Prevalence of human soil-transmitted helminth infections in rural areas of Guizhou Province in 2015[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2019, 37(6): 670-675.

Figures/Tables 2

Table 1

Table 2

Population distribution of human soil-transmitted helminth infections in rural areas of Guizhou Province in 2015

特征Feature	检查人数No.examined	总感染人数No.infected	总感染率/%Infection rate/%	蛔虫 A. lumbricoides		鞭虫 Whipworm		钩虫 Hookworm		蛲虫^a E. vermicularis^a
特征Feature	检查人数No.examined	总感染人数No.infected	总感染率/%Infection rate/%	感染人数No.infected	感染率/%Infection rate/%	感染人数No.infected	感染率/%Infection rate/%	感染人数No.infected	感染率/%Infection rate/%	感染人数No.infected	感染率/%Infection rate/%
性别Gender
男性Male	3 756	472	12.6	271	7.2	72	1.9	181	4.8	11	0.3
女性Female	3 816	655	17.2	343	9.0	91	2.4	296	7.8	10	0.3
小计Subtotal	7 572	1 127	14.9	614	8.1	163	2.2	477	6.3	21	0.3
年龄Age
0~10	1 128	126	11.2	96	8.5	30	2.7	16	1.4	20	1.8
10~20	1 344	205	15.3	153	11.4	56	4.2	37	2.8	0	0
20~30	578	54	9.3	34	5.9	4	0.7	21	3.6	0	0
30~40	907	112	12.4	61	6.7	20	2.2	41	4.5	0	0
40~50	1 233	173	14.0	96	7.8	15	1.2	72	5.8	0	0
50~60	953	159	16.7	61	6.4	15	1.6	102	10.7	0	0
60~70	901	187	20.8	69	7.7	13	1.4	122	13.5	0	0
≥70	528	111	21.0	44	8.3	10	1.9	66	12.5	1	0.2
小计Subtotal	7 572	1 127	14.9	614	8.1	163	2.2	477	6.3	21	0.3
职业Occupation
农（牧、渔）民Farmer (herdsman and fisherman)	4 946	780	15.8	354	7.2	74	1.5	422	8.5	1	0.0
学生Student	1 871	277	14.8	207	11.1	74	4.0	48	2.6	4	0.2
学龄前儿童 Preschool child	541	48	8.9	37	6.8	10	1.9	3	0.6	16	3.0
其他Others	214	22	10.3	16	7.5	5	2.3	4	1.9	0	0
小计Subtotal	7 572	1 127	14.9	614	8.1	163	2.2	477	6.3	21	0.3
民族Nationality
汉族Han	4 854	649	13.4	415	8.6	71	1.5	231	4.8	7	0.1
侗族Dong	930	157	16.9	46	5.0	24	2.6	102	11.0	10	1.1
布依族Buyi	835	131	15.7	43	5.2	30	3.6	77	9.2	0	0
仡佬族Gelao	275	63	22.9	39	14.2	6	2.2	22	8.0	1	0.4
苗族Miao	202	35	17.3	17	8.4	4	2.0	22	10.9	2	1.0
彝族Yi	163	31	19.0	23	14.1	8	4.9	2	1.2	1	0.6
其他Others	313	61	19.5	31	9.9	20	6.4	21	6.7	0	0
小计Subtotal	7 572	1 127	14.9	614	8.1	163	2.2	477	6.3	21	0.3
文化程度Education levels
文盲lliteracy	1 133	214	18.9	73	6.4	15	1.3	140	12.4	1	0.1
小学Primary school	4 004	656	16.4	372	9.3	107	2.7	268	6.7	3	0.1
初中Junior high school	1 666	177	10.6	109	6.5	28	1.7	58	3.5	0	0
高中及以上Senior high school and above	234	31	13.3	22	9.4	3	1.3	7	3.0	0	0
学龄前儿童 Preschool children	535	49	9.2	38	7.1	10	1.9	4	0.8	17	3.2
小计Subtotal	7 572	1 127	14.9	614	8.1	163	2.2	477	6.3	21	0.3

Table 2

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