The epidemiological characteristics of visceral leishmaniasis in Longnan City from 2005 to 2021

doi:10.12140/j.issn.1000-7423.2023.05.009

Abstract

Abstract:

Objective To analyze the epidemiological characteristics of visceral leishmaniasis cases in Longnan City, Gansu Province from 2005 to 2021, to provide scientific basis for formulating prevention and control strategy for visceral leishmaniasis. Methods The information on the visceral leishmaniasis cases residing at the current address in Longnan City, reported by the National Infectious Disease Surveillance Reporting and Management System from 2005 to 2021, was collected. A database was established using Microsoft Excel 2013. Three-dimentional distribution characteristics of visceral leishmaniasis cases were analyzed with descriptive epidemiological method. The distribution map of reported cases was plotted by Arc GIS 10.2. Statistical analysis was performed using SPSS 25.0 software. Results From 2005 to 2021, a total of 1 109 cases of visceral leishmaniasis were reported in Longnan City,among them, 577 cases were of clinical diagnosis, and 532 confirmed cases. The annual average incidence rate was reported at 2.49/100 000, showing a low prevalence status. The incidence rate reached 2.76/100 000 in 2005, rose to 4.53/100 000 in 2009, and gradually dropped to 0.46/100 000 in 2021, indicating a trend of first increase and then decrease (χ² = 267.561, P < 0.01). The visceral leishmaniasis cases were mainly distributed in Wudu District (606 cases), Wenxian County (323 cases) and Tanchang County (148 cases), accounting for 97.11% of reported cases (1 077/1 109). In some villages/towns of endemic counties, a cluster of high incidence was found. There were 633 male cases and 476 female cases, and the sex ratio was 1.33∶1; the incidence rates in males and females were 2.73/100 000 and 2.23/100 000, respectively (χ² = 2.699, P > 0.05). The number of reported cases in the 0-4 age group accounted for 50.50% (560/1 109) of the total number of reported cases, with the highest incidence rate of 19.62/100 000. The second is the 5-9 age group, with the number of reported cases accounting for 12.80% (142/1 109) of the total number of reported cases, and the incidence rate is 4.84/100 000. It indicated that the incidence rate tends to decrease with age (χ² = 14.942, P < 0.01). The first incidence rate was occupied in children of scattered living, accounting for 41.12% (456/1 109), and the second in peasants, accounting for 24.71% (274/1 109). Conclusion In Longnan City of Gansu Province, visceral leishmaniasis remains at a low prevalent status. The reported cases are mainly of children. There is a recurgence trend in historically endemic counties.

Key words: Visceral leishmaniasis, Incidence trend, Epidemiological characteristics

CLC Number:

R531.6

WANG Xiaojun, CAI Yucheng, ZOU Xuan, LI Hui, TONG Bobo. The epidemiological characteristics of visceral leishmaniasis in Longnan City from 2005 to 2021[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2023, 41(5): 579-585.

Figures/Tables 6

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References 23

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年龄组/岁 Age group/year	男性 Male			女性 Female			合计 Total
年龄组/岁 Age group/year	人口数 Population	病例数 No. case	发病率/100 000^-1 Incidence rate/ 100 000^-1	人口数 Population	病例数 No. case	发病率/100 000^-1 Incidence rate/ 100 000^-1	人口数 Population	病例数 No. case	发病率/100 000^-1 Incidence rate/ 100 000^-1
0~4	1 487 697	315	21.17	1 366 984	245	17.92	2 854 681	560	19.62
5~9	1 525 450	74	4.85	1 407 334	68	4.83	2 932 784	142	4.84
10~14	1 533 686	38	2.48	1 422 295	30	2.11	2 955 981	68	2.3
15~19	1 931 364	30	1.55	1 854 474	27	1.46	3 785 838	57	1.51
20~24	1 906 649	21	1.1	1 850 670	22	1.19	3 757 319	43	1.14
25~29	1 518 336	17	1.12	1 417 131	15	1.06	2 935 467	32	1.09
30~34	1 630 633	17	1.04	1 484 605	17	1.15	3 115 238	34	1.09
35~39	2 192 834	29	1.32	1 970 592	15	0.76	4 163 426	44	1.06
40~44	2 268 205	17	0.75	2 003 402	9	0.45	4 271 607	26	0.61
45~49	1 860 687	19	1.02	1 600 675	9	0.56	3 461 362	28	0.81
50~54	1 168 244	15	1.28	1 011 222	4	0.4	2 179 466	19	0.87
55~59	1 105 491	14	1.27	986 164	5	0.51	2 091 655	19	0.91
60~64	991 799	10	1.01	909 334	3	0.33	1 901 133	13	0.68
65~69	867 899	9	1.04	812 395	3	0.37	1 680 294	12	0.71
70~74	610 320	8	1.31	594 622	4	0.67	1 204 942	12	1
≥ 75	571 047	0	0	641 199	0	0	1 212 246	0	0
合计 Total	23 170 341	633	2.73	21 333 098	476	2.23	44 503 439	1 109	2.49

职业 Occupation	病例数 No. case	构成比/% Composition rate/%
散居儿童 Scattered child	456	41.12
农民 Farmer	274	24.71
学生 Student	209	18.85
幼托儿童 Child care	143	12.89
家务及待业 Housewife and unemployed	8	0.72
干部职员 Official	5	0.45
离退人员 Retired personnel	4	0.36
工人 Worker	3	0.27
教师 Teacher	2	0.18
牧民 Herdsman	2	0.18
商业服务 Business service	2	0.18
医务人员 Medical personnel	1	0.09
合计 Total	1 109	100