Surveillance and analysis of imported malaria from abroad in Baise, Guangxi, 2009–2019

Objective To collect and analyze the epidemic regularity and distribution characteristics of imported malaria in Baise from 2009 to 2019, and we provide scientific basis for Baise to formulate appropriate prevention and control strategies and measures after realizing the goal of eliminating malaria. Methods The results of imported malaria surveillance from abroad in Baise from 2009 to 2019 were collected, analyzed and summarized. Results From 2009 to 2019, a total of 50 malaria cases were reported in Baise, of which 49 cases (98.00%) were blood positive, and 1 case (2.00%) was clinically diagnosed; The distribution of malaria species in blood test positive cases: 14 cases (28.57%) were vivax, 34 cases (69.39%) were falciparum, there was 1 case (2.04%) of ovum type malaria. No mixed infection and malariae malaria cases were found. The largest regional distribution of imported cases was in Longlin Various Nationalities Autonomous County (25 cases, 50.00%); all cases were male; except for a peak in January 2012, there was no significant seasonal distribution of cases overall; The average time from return to onset was 7.2 days, and the average time from onset to diagnosis was 7.8 days; 32 cases (64.00%) were reported by county CDC; Two cases of critical illness occurred in 2016 and 2018 respectively, and no fatal cases occurred. After the last local malaria case was reported in 2008, all malaria cases have been reported as imported malaria cases so far. In 2016, all cases reached the assessment criteria of malaria elimination at the district level in Guangxi, imported malaria cases have not resulted in secondary cases in the urban area of Baise. Conclusion The Malaria Control Strategy and comprehensive anti-malaria measures adopted in Baise are effective under the current situation of malaria control with no local cases. In the future, the measures of aetiological surveillance will be further implemented, health education and training for malaria control will be carried out, and the monitoring of the migrating population will be strengthened. 摘要:目的 分析2009—2019年百色市境外输人性疟疾疫情流行规律和分布特征,为百色市实现消除疟疾的目标 后制定适合的防控策略和措施提供科学依据。 方法 收集及整理2009—2019年百色市境外输人性疟疾疫情监测结果 并对数据进行分析和总结。 结果 2009—2019年百色市累计报告疟疾病例50例,其中49例为血检阳性病例 (98.00%),1例为临床诊断病例（2.00%)。血检阳性病例中虫种分布情况为：间日疟14例（28.57%),恶性疟34例 (69.39%),卵型疟1例(2.04%),无混合感染病例和三日疟病例的发现。输人性病例地区分布以隆林县最多(25例, 50.00%)性别全部为男性；除了 2012年1月份有一个高峰期外,总体上病例无明显的季节分布;从回国至发病平均时 间为7.2 d,从发病至确诊的平均时间为7.8 d;县级疾控中心报告32例（64.00%);危重症病例2例,分别于2016年及 2018年出现,无因重症而死亡的病例出现。2008年报告最后一例本地感染疟疾病例后,至今疟疾病例报告全部为境外 输人性,2016年达到广西壮族自治区消除疟疾考核评估的标准,输人性疟疾病例未在百色市辖区内引起继发性病例。 结论 百色市在没有本地病例的疟疾防治现状下采取的疟疾防控策略和综合抗疟措施有效。今后应进一步落实病原 学监测的措施,开展疟疾防治的健康教育宣传和培训以及加强对流动人口的监测。