Epidemiology of echinococcosis at the disease surveillance spots in Sichuan Province from 2016 to 2019

doi:10.12140/j.issn.1000-7423.2021.02.002

Abstract

Abstract:

Objective To understand the dynamic changes of echinococcosis endemic in Sichuan Province from 2016 to 2019, in order to provide reference for further prevention and control. Methods In 2016—2019, ultrasonographic examination was carried out to detect echinococcosis in the permanent residents aged over 2 years within the surveillance sites of Sichuan Province. Feces of domestic dogs and stray dogs were collected for detection of Echinococcus coproantigen, and internal organs of livestock and rodents in the surveillance counties were examined by palpation and necropsy to identify hydatid infection. Results Population surveillance at 35 sites showed that the detection rate of new cases of echinococcosis showed a trend of decrease from 0.15% (72/48 976) in 2016 to 0.02% (13/81 725) in 2019 (P < 0.05). A total of 115 new patients were detected, of them 80.87% (93/115) were from Garze Tibetan Autonomous Prefecture. Among the new cases, 59.13% (68/115) were of alveolar echinococcosis (AE), 38.26% (44/115) cystic echinococcosis (CE), and 2.61% (3/115) were found to be extrahepatic echinococcosis. The positive rates of Echinococcus coproantigen in domestic dogs from 2016 to 2019 were 1.19% (28/2 348), 2.35% (52/2 212), 3.43% (69/2 010) and 0.95% (35/3 668), and in stray dogs 2.87%(13/453), 2.00% (8/400), 4.69% (15/320) and 0.80% (5/624), respectively, with significant difference between the years (P < 0.05), and these rates in 2019 decreased by 20% and 72% compared to 2016. During 2016—2019, the prevalence in livestock were 4.45% (146/3 283), 1.53% (50/3 273), 2.93% (75/2 564) and 2.18% (89/4 078), and the prevalence in rodents were 1.71% (123/7 204), 2.48% (185/7 470), 1.19% (67/5 613) and 1.47% (154/10 477), respectively, with significant difference between the years (P < 0.05), and the prevalence in 2019 decreased by 51% and 14% compared to that in 2016. Conclusion The detection rate of new echinococcosis cases, the positive rate of dog coproantigen, the infection rate in intermediate hosts showed a overall decreasing trend from 2016 to 2019 in Sichuan Province, but the positive rate of dog coproantigen and infection rate in intermediate hosts were fluctuated.

Key words: Sichuan province, Echinococcosis, Surveillance, Endemic

CLC Number:

R532.32

LIAO Sha, WANG Qi, HE Wei, ZHANG Guang-jia, YU Wen-jie, YANG Liu, YAO Ren-xin, LI Rui-rui, HUANG Yan, LIU Yang, ZHONG Bo, WANG Qian. Epidemiology of echinococcosis at the disease surveillance spots in Sichuan Province from 2016 to 2019[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2021, 39(2): 139-144.

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References 18

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年份 Year	监测点数/个No. surveillan sites	不同流行程度监测点数/个 No. surveillance sites at different degrees of endemic			细粒棘球蚴病流行区监测点数/个 No. CE endemic counties	混合型流行区监测点数/个 No. CE and AE endemic counties	监测范围 Surveillance scope
年份 Year	监测点数/个No. surveillan sites	Ⅰ	Ⅱ	Ⅲ	细粒棘球蚴病流行区监测点数/个 No. CE endemic counties	混合型流行区监测点数/个 No. CE and AE endemic counties	（乡）镇数/个 No. towns	行政村数/个 No. villages	常驻人口数 Resident population
2016	22	10	9	3	11	11	23	118	62 296
2017	19	10	9	0	10	9	20	105	53 537
2018	19	10	9	0	10	9	20	105	53 537
2019	35	12	15	8	20	15	40	226	96 632