Abstract：Objective To analyze the epidemiological characteristics of imported malaria in Nanjing City from 2017 to 2025, so as to provide evidence for formulating and optimizing malaria prevention and control strategies. Methods Data on laboratory-confirmed imported malaria cases reported in Nanjing City from 2017 to 2025 through the Surveillance System of China Information System for Disease Control and Prevention were collected, including gender, age, laboratory results, import sources and diagnosis and treatment status. Descriptive analyses were conducted on the type of malaria, population distribution, temporal distribution, regional distribution, import sources, interval from onset to visit, interval from visit to diagnosis, first-visit institution, diagnosing institution and first-visit diagnosis rate of imported malaria cases. Results A total of 148 imported malaria cases were reported in Nanjing City from 2017 to 2025, Plasmodium falciparum malaria was predominant, accounting for 116 cases (78.38%). The number of reported cases was relatively high in males, accounting for 141 cases (95.27%). The number of reported cases was relatively high in the 20-<40 years and 40-<60 years groups, with 71 and 70 cases, accounting for 47.97% and 47.30%, respectively. The main occupations were workers, technicians, commercial service personnel and overseas students, with 62, 25, 21 and 20 cases, accounting for 41.89%, 16.89%, 14.19% and 13.51%, respectively. Imported malaria cases were reported in all months, with a relatively high number of reported cases in January, accounting for 21 cases (14.19%). Among the 12 districts, nine districts reported imported malaria cases, and Jiangning District reported a relatively high number of cases, accounting for 86 cases (58.11%). There was 1 case of transfusion-transmitted infection and 147 cases of overseas importation. Overseas importation was mainly from Africa, accounting for 137 cases (93.20%); 8 and 2 cases were imported from Asia and Oceania, accounting for 5.44% and 1.36%, respectively. The median interval from onset to visit and the interval from visit to diagnosis were 1.0 (interquartile range, 3.0) d and 0 (interquartile range, 1.00) d, respectively. The first-visit institutions and diagnosing institutions were mainly municipal-level medical institutions, with 82 and 106 cases, accounting for 55.41% and 71.62%, respectively. There were 91 cases diagnosed at first visit, with a first-visit diagnosis rate of 61.49%, and the first-visit diagnosis rates of medical institutions at all levels were lower than 70%. Conclusions From 2017 to 2025, imported malaria cases in Nanjing City were predominantly Plasmodium falciparum malaria, mainly in males and young and middle-aged adults, and the main import source was Africa. The first-visit diagnosis capacity of medical institutions remained insufficient.
何伊莎, 谢朝勇, 王毓, 李燕菁. 2017—2025年南京市输入性疟疾流行病学特征分析[J]. 预防医学, 2026, 38(10): 1032-1035.
HE Yisha, XIE Chaoyong, WANG Yu, LI Yanjing. Epidemiological characteristics of imported malaria in Nanjing City from 2017 to 2025. Preventive Medicine, 2026, 38(10): 1032-1035.
