CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES ›› 2024, Vol. 42 ›› Issue (1): 91-97.doi: 10.12140/j.issn.1000-7423.2024.01.013

• ORIGINAL ARTICLES • Previous Articles     Next Articles

Analysis on implementation and effectiveness of imported malaria surveillance-response system post-elimination in Shanghai

ZHU Min1(), ZHANG Hao2, WU Liming2, ZHANG Chengang1, ZHANG Yaoguang1, WANG Zhenyu1, CHEN Jian1, WU Huanyu1, CHEN Xin1,*()   

  1. 1 Shanghai Municipal Center for Disease Control and Prevention; Shanghai Preventive Healthcare Research Institute, Shanghai 200336, China
    2 Shanghai Municipal Bureau of Disease Control and Prevention, Shanghai 200115, China
  • Received:2023-07-20 Revised:2023-09-11 Online:2024-02-28 Published:2024-03-12
  • Contact: *E-mail: chenxin@scdc.sh.cn
  • Supported by:
    Fifth Round Three-Year Action Plan on Key Subject of Shanghai Public Health System Construction(GWV-10.1-XK13)

Abstract:

Objective To analyze the implementation and effectiveness of imported malaria surveillance-response system in Shanghai after malaria elimination, and to provide scientific basis for maintaining malaria post-elimination status and consolidating the achievements of malaria elimination. Methods The activity plan and records related to malaria surveillance-response in Shanghai were systematically collected and sorted. The data of individual malaria case in 2017—2022 from web-based National Information System for Infectious Disease surveillance and National Information System for Parasitic Diseases Control and Prevention were analyzed using SPSS 25.0. Results From 2017 to 2022, a total of 281 malaria cases were reported in Shanghai, including Shanghai nationality (16.7%, 47/281), other province nationality (76.5%, 215/281) and foreign nationality (6.8%, 19/281), all of them have the malaria-endemic areas traveling experiences. All reported cases were imported from abroad, the mainly infection sources were African countries, such as Guinea (17.4%, 49/281), Nigeria (14.2%, 40/281) and the Democratic Republic of the Congo (12.1%, 34/281). The reported cases were mainly falciparum malaria (83.3%, 234/281) and mainly reported from Jinshan District (15.7%, 44/281), Pudong New Area (14.9%, 42/281) and Minhang District (11.7%, 33/281). A total of 106 361 blood tests were performed in Shanghai from 2017 to 2022, with a positive rate of 3.3‰ (353/106 361). The positive rates of passive case detection, proactive case detection and reactive case detection were 3.6‰ (350/97 917), 0.4‰ (3/7 828) and 0 (0/616), respectively. Malaria reported cases were mainly detected by passive monitoring (98.9%, 278/281). All cases were reported in 24 hours after diagnosis and checked in 1 day after reporting, the rate of individual cases epidemiological investigation within 2 days was 90.0% (253/281), all foci were investigated and disposed within 3 days, and all cases were assessed in one month without transmission risks. The median time from the illness onset to confirmed diagnosis was 2 d (P25, P75: 1 d, 4 d). A total of 2 126 Anopheles were captured, all of which were Anopheles sinensis. The mainly distribution areas were suburban districts such as Jiading District (31.6%, 672/2 126) and Chongming District (24.9%, 529/2 126). Conclusion The surveillance-response system of imported malaria was operated well in Shanghai after malaria elimination and the epidemic handling was standardized and timely.

Key words: Malaria, Eliminate, Surveillance and response, Shanghai

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