Surveillance on imported malaria in Linyi City of Shandong Province from 2015 to 2021

doi:10.12140/j.issn.1000-7423.2023.02.022

Abstract

Abstract:

The information on imported malaria cases and pidemiological case investigation in Linyi City, Shandong Province, from 2015—2021 were collected and analyzed. A total of 78 imported malaria cases were reported, including 65 cases of Plasmodium falciparum infection (83.3%), 11 cases of P. ovale infection (14.1%), 1 case of P. vivax infection (1.3%), and 1 case of P. malariae infection (1.3%). Among the reported cases, 1 case was imported from Myanmar (1.3%), and the remaining 77 cases were imported from African countries (98.7%). There was no obvious seasonal variation in the time of case reporting, but there were peaks in April, August, October and January; the main areas of case reporting were Hedong District (43 cases) and Lanshan District (16 cases) in Linyi City. The reported cases were all young and middle-aged males, with an average age of (41.03 ± 9.18) years old, and most cases were among the returned workers (68 cases). Among the reported cases, 38 were seen on the same day from the onset of symptoms, and the longest symptom-to-diagnosis interval was 30 days. All the reported cases had a history of overseas residence from 1 month to 3 years before the onset of the symptoms. The primary diagnosis and treatment units were mainly to medical units at the county level or below, accounting for 65.4% (51/78); the misdiagnosis rate of the initial diagnosis was 37.2% (29/78). 8 cases (10.3%) presented with complications. It is recommended to focus on providing health education on malaria prevention and control knowledge for labor exporting personnel, strengthen monitoring of mobile populations, and timely conduct pathogen screening and verification for personnel traveling to high malaria prevalence areas.

Key words: Imported malaria, Epidemiological investigation, Labor export, Linyi city

CLC Number:

R531.3

LIU Jiancheng, XU Yan, WANG Longjiang, KONG Xiangli, WANG Yongbin, LI Yuejin. Surveillance on imported malaria in Linyi City of Shandong Province from 2015 to 2021[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2023, 41(2): 249-252.

Figures/Tables 5

References 22

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年份	总病例数	不同病种病例数				报告病例年龄分布/岁		报告病例出境事由
年份	总病例数	恶性疟	间日疟	卵形疟	三日疟	平均年龄 ± 标准差	最小值 ~ 最大值	务工	经商	旅游	其他
2015	13	12	1	0	0	39.46 ± 9.53	26 ~ 51	13	0	0	0
2016	12	11	0	0	0	40.67 ± 9.38	21 ~ 52	12	0	0	0
2017	9	8	0	2	0	40.89 ± 7.04	28 ~ 48	7	2	0	0
2018	10	7	0	3	0	42.50 ± 9.32	29 ~ 54	9	1	0	0
2019	23	19	0	4	0	41.48 ± 11.05	19 ~ 61	18	2	2	1
2020	8	7	0	1	0	40.50 ± 6.41	33 ~ 49	6	1	0	1
2021	3	1	0	1	1	42.67 ± 10.12	31 ~ 49	3	0	0	0
合计	78	65	1	11	1	41.03 ± 9.18	19 ~ 61	68	6	2	2

输入来源	恶性疟	间日疟	卵形疟	三日疟	合计
尼日利亚	10	0	4	0	14
南苏丹	0	0	0	1	1
莫桑比克	3	0	0	0	3
加蓬	13	0	2	0	15
安哥拉	11	0	0	0	11
加纳	3	0	0	0	3
赤道几内亚	9	0	1	0	10
喀麦隆	5	0	1	0	6
刚果共和国	3	0	2	0	5
坦桑尼亚	1	0	0	0	1
利比里亚	1	0	0	0	1
科特迪瓦	2	0	0	0	2
缅甸	0	1	0	0	1
赞比亚	2	0	1	0	3
卢旺达	1	0	0	0	1
贝宁	1	0	0	0	1
合计	65	1	11	1	78

变量	恶性疟	间日疟	三日疟	卵形疟	总病例数
发病-就诊时间间隔
< 12 h	12	0	0	2	14
12~24 h	26	0	0	2	28
1~7 d	21	1	1	7	30
7~14 d	2	0	0	0	2
> 14 d	4	0	0	0	4
初诊结果
疟疾	40	0	1	8	49
其他疾病	25	1	0	3	29
初次就诊机构
地市级	24	0	0	3	27
县级	22	1	1	6	30
乡镇卫生院	5	0	0	1	6
村卫生室	10	0	0	1	11
私人诊所	4	0	0	0	4
境外旅居史
发病前1个月	64	1	1	7	73
发病前1年内	1	0	0	2	3
发病前3年内	0	0	0	2	2
有无并发症
有	8	0	0	0	8
无	57	1	1	11	70