目的 分析2019—2023年山西省土源性线虫感染情况，了解其流行现状和趋势，为制定土源性线虫病防治策略提供科学依据。 方法 2019—2023年，按照《全国肝吸虫病和土源性线虫病监测方案（试行）》的要求，山西省分别选取14、18、15、18、18个监测县（共79个不同的县，2021—2023年各有2个固定监测县），每个监测县按照东、南、西、北、中5个地理方位划片，每片区随机抽取1个乡（镇、街道）的1个行政村开展监测工作，每个行政村以3周岁及以上常住居民为调查对象，整群抽取人数不少于200人。采集调查对象粪样不少于30 g，采用改良加藤厚涂片法（Kato-Katz法，一粪两检）镜检土源性线虫虫卵，计算感染率。对钩虫阳性的粪样采用试管滤纸培养法进行虫种鉴定。对3~9周岁儿童采用透明胶纸肛拭法加做蛲虫虫卵镜检。感染率的比较采用χ²检验。 结果 2019—2023年，山西省监测人群土源性线虫感染率分别为0.05%（7/14 189）、0.05%（9/18 019）、0.12%（18/15 024）、0（0/18 109）、0.11%（21/18 383），不同年份间感染率差异有统计学意义（χ² = 26.464，P < 0.01）。2019—2023年，蛔虫感染率分别为0.02%（3/14 189）、0.01%（1/18 019）、0（0/15 024）、0（0/18 109）、0.04%（8/18 383）；蛲虫感染率分别为0.02%（3/14 189）、0.04%（8/18 019）、0.12%（18/15 024）、0（0/18 109）、0.07%（13/18 383）。蛔虫、蛲虫不同年份间感染率差异有统计学意义（χ² = 13.586、27.674，均P < 0.01）。2019年鞭虫感染率为0.007%（1/14 189），其余年份感染率均为0。2019—2023年，均未查出钩虫感染。2019—2023年，男、女性土源性线虫平均感染率分别为0.07%（30/40 707）、0.06%（25/43 017），差异无统计学意义（χ² = 0.773，P > 0.05）；各年龄组中土源性线虫平均感染率最高的为3~9岁组（0.30%，30/9 913），其次为50~59岁组（0.05%，8/14 828）和20~29岁组（0.05%，3/5 938），不同年龄组间的差异有统计学意义（χ² = 98.579，P < 0.01）；不同职业人群中散居儿童土源性线虫平均感染率最高（0.90%，6/665），幼托儿童次之（0.36%，17/4 707），不同职业人群间的差异有统计学意义（χ² = 64.542，P < 0.01）；不同文化程度人群中，学龄前儿童的土源性线虫平均感染率最高（0.42%，23/5 433），小学的次之（0.07%，16/24 103），不同文化程度人群间的差异有统计学意义（χ² = 57.218，P < 0.01）。2019—2023年，山西省11个市79个不同的监测县（区）中，17个县出现阳性感染者。其中运城市夏县的土源性线虫感染率最高，为1.00%（10/1 000）；吕梁市文水县和晋中市灵石县次之，均为0.60%（6/1 003）和0.60%（6/1 003）。不同监测县间感染率差异有统计学意义（χ² = 29.741，P < 0.05）。 结论 2019—2023年山西省土源性线虫感染率呈低水平流行趋势，感染虫种以蛲虫为主，需进一步加强儿童、老人等重点人群土源性线虫感染的综合防治工作。

Objective To analyze the surveillance of soil-transmitted nematode (STN) infection in Shanxi Province from 2019 to 2023, to understand its current status and trends, providing scientific basis for developing control strategies. Methods From 2019 to 2023, in accordance with the requirements of the National Surveillance Program and Implementation Guideline for Clonorchiasis and Soil-transmitted Nematodes, in different regions of Shanxi Province, 14, 18, 15, 18, and 18 counties were selected for the surveillance, respectively. Each selected surveillance county was divided into five geographic sectors (east, south, west, north, and center). From each sector, one township (town, street) was randomly selected, and subsequently, one administrative village was chosen from each selected township for the surveillance. In each selected village, the participants were cluster sampled, with no less 200 villigers for the survey. Fecal samples of no less than 30 g were collected from the participants, and examined microscopically using the modified Kato-Katz thick smear method (two slide-reading, each sample) for STN eggs to calculate the infection rate. Hookworm egg positive fecal samples were further examined using the test tube-filter paper cultivation method to identify the parasite species. Additionally, microscopic-detection of Enterobius vermicularis eggs was conducted in children aged 3 to 9 using the transparent adhesive paper anal swab method. χ² test was employed to compare infection rates. Results From 2019 to 2023, the infection rates of STN in the surveillance population in Shanxi Province were 0.05% (7/14 189), 0.05% (9/18 019), 0.12% (18/15 024), 0 (0/18 109), and 0.11% (21/18 383), respectively. There were statistically significant differences in infection rates between years (χ² = 26.464, P < 0.01). During this period, the infection rates of Ascaris lumbricoides were 0.02% (3/14 189), 0.01% (1/18 019), 0 (0/15 024), 0 (0/18 109), 0.04% (8/18 383); and the infection rates of E. vermicularis were 0.02% (3/14 189), 0.04% (8/18 019), 0.12% (18/15 024), 0 (0/18 109), 0.07% (13/18 383), respectively. The infection rates of both A. lumbricoides and E. vermicularis showed statistically significant differences between years (χ² = 13.586 and 27.674, both P < 0.01). The Trichuris trichiura infection rate was 0.007% (1/14 189) in 2019, and 0 in the subsequent years. Notably, no hookworm infections were found from 2019 to 2023. Regarding gender, the infection rates for STNs in male and female were 0.07% (30/40 707), and 0.06% (25/43 017), respectively, with no statistically significant difference (χ² = 0.773, P > 0.05). In age groups, the highest infection rate of STNs was 0.30% (30/9 913) in the 3-9 year-old group, followed by 0.05% (8/14 828) in the 50-59 year-old group, and 0.05% (3/5 938) in the 20-29 year-old group. There were statistically significant differences in the infection rates between different age groups (χ² = 98.579, P < 0.01). Among different occupations, scattered children had the highest average infection rate (0.90%, 6/665), followed by nursery children (0.36%, 17/4 707). The differences in infection rates among different occupations were statistically significant (χ² = 64.542, P < 0.01). In terms of literacy levels, preschool children had the highest average infection rate of 0.42% (23/5 433), followed by elementary school at 0.07% (16/24 103). There was a statistically significant difference in infection rates among different literacy levels (χ² = 57.218, P < 0.01). In 2019—2023, Shanxi Province completed monitoring in 79 different surveillance counties in 11 cities, with positive infections found in 17 of these counties. Xia County of Yuncheng City had the highest infection rate of 1.00% (10/1 000), followed by Wenshui County of Lvliang City, and Lingshi County of Jinzhong City, both at 0.60% (6/1 003) 0.60% (6/1 003). The differences in infection rates among the different surveillance counties were statistically significant (χ² = 29.741, P < 0.05). Conclusion The infection rate of STN in Shanxi Province from 2019 to 2023 showed a trend of low-level prevalence, with E. vermicularis being the primary parasite. It is necessary to further strengthen the comprehensive control of STN infections, particularly among key populations such as children and the elderly.