Investigation on potential risk factors for angiostrongyliasis transmission across Chongming District, Shanghai Municipality

doi:10.12140/j.issn.1000-7423.2026.04.023

Abstract

Abstract:

To investigate the potential risk factors for angiostrongyliasis transmission across Chongming District of Shanghai Municipality, so as to provide insights into monitoring and assessment of angiostrongyliasis transmission risk in this island. A survey was conducted on Pomacea snail distribution across Chongming District of Shanghai Municipality, from April to October 2023, and six high-risk townships with relatively large areas of Pomacea snail-infested habitats south of the Yangtze River in the island were selected for a retrospective survey of angiostrongyliasis cases, survey of paratenic hosts, wild environments and market-sold snails, and field questionnaire surveys among residents. In addition, wild mice were captured with a trapping method at night from a representative township for detection of Angiostrongylus cantonensis infections. There were 15 out of 18 townships detected with Pomacea snails in Chongming District. A total of 60 wild environments were investigated in 6 high-risk townships, with 1 228 Pomacea snails captured. A total of 1 200 Cipangopaludina cathayensis and 12 Bellamya aeruginosa snails were sampled from 18 farmers’ markets and restaurants, with no Pomacea snails or Lissachatina fulica found, and a total of 257 paratenic hosts (freshwater fish, river shrimp, and river crabs) were collected, with no A. cantonensis infections detected. A total of 105 wild mice were captured from Shuangjin Village, Gangxi Township, with no adult A. cantonensis worms identified. A total of 300 questionnaires were allocated in 6 townships, with a 100% recovery rate, and the awareness rate of angiostrongyliasis control knowledge was 22% (66/300), with a relatively high awareness rate among respondents at ages of 20 to 39 years (30.37%, 41/135), urban residents (32.65%, 32/98), and respondents with an educational level of junior college and above (30.56%, 44/144) (χ² = 13.193, 16.624, 11.923, P < 0.05). There were 65.99% (198/300) of respondents with at least one of the five living habits of eating raw snails or snails stewed in soy sauce, eating raw or half-cooked snail meat, eating drunk crabs and/or drunk shrimps and crab paste, drinking filtered water or tap water directly, and contact with Pomacea snails or slugs, with the highest proportion for eating drunk crabs and/or drunk shrimps and crab paste (11.67%, 35/300). In addition, 3.67% (11/300) of respondents had a tendency to purchase or consume Pomacea snails. There is a relatively complete transmission chain for angiostrongy-liasis throughout Chongming District, with potential risks for both imported and local transmission. It is recommended to reinforce the dynamic systemic risk monitoring of the “human-animal-environment” and respond to emergency events.

Key words: Pomacea, Angiostrongyliasis, Potential transmission risk

CLC Number:

R532.1

LI Chunyuan, JIN Yanjun, YANG Jiawei, CHENG Gang, HUANG Jiayin, WANG Shuang, YU Qing. Investigation on potential risk factors for angiostrongyliasis transmission across Chongming District, Shanghai Municipality[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2026, 44(4): 615-618.

Figures/Tables 2

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调查镇	调查场所数	中华圆田螺/只			铜锈环棱螺/件			淡水鱼/件			河虾/件			河蟹/件
调查镇	调查场所数	采样数	检测数	阳性数	采样数	检测数	阳性数	采样数	检测数	阳性数	采样数	检测数	阳性数	采样数	检测数	阳性数
城桥镇	3	200	200	0	2	2	0	27	27	0	5	5	0	15	15	0
港西镇	3	200	200	0	2	2	0	0	0	0	0	0	0	0	0	0
新河镇	3	200	200	0	2	2	0	33	33	0	7	7	0	8	8	0
堡镇	3	200	200	0	2	2	0	33	33	0	5	5	0	10	10	0
陈家镇	3	200	200	0	2	2	0	25	25	0	7	7	0	6	6	0
长兴镇	3	200	200	0	2	2	0	50	50	0	6	6	0	20	20	0
合计	18	1 200	1 200	0	12	12	0	168	168	0	30	30	0	59	59	0

特征	调查人数	知晓率/％（人数）	χ²值	P值
性别			0.601	> 0.05
男	151	23.84（36）
女	149	20.13（30）
年龄组/岁			13.193	< 0.05
20~39	135	30.37（41）
40~59	125	18.40（23）
≥ 60	40	5.00（2）
户籍			0.251	> 0.05
上海	241	20.75（50）
外省（直辖市、自治区）	59	23.73（14）
常住地			16.624	< 0.05
城区	98	32.65（32）
郊区	69	27.54（19）
农村	133	11.28（15）
学历			11.923	< 0.05
初中及以下	105	13.33（14）
高中、中专	51	15.69（8）
大专及以上	144	30.56（44）
职业			6.759	> 0.05
商业服务行业	130	21.54（28）
农牧渔	48	10.42（5）
干部	96	29.17（28）
离退或待业	26	19.23（5）
生活习惯
食凉拌或酱爆螺蛳	300	8.00（24）
食生或半生螺肉	300	3.00（9）
食醉蟹、醉虾、蟹糊	300	11.67（35）
接触福寿螺或蛞蝓	300	3.67（11）
购买或者食用福寿螺	300	3.67（11）
直接饮过滤水或自来水	300	4.00（12）