Analysis on implementation and effectiveness of imported malaria surveillance-response system post-elimination in Shanghai
Objective To analyze the implementation and effectiveness of imported malaria surveillance-re-sponse system in Shanghai after malaria elimination,and to provide scientific basis for maintaining malaria post-elimi-nation status and consolidating the achievements of malaria elimination.Methods The activity plan and records re-lated to malaria surveillance-response in Shanghai were systematically collected and sorted.The data of individual ma-laria 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％o(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 epide-miological 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 Dis-trict(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.
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