Temporal and spatial distribution of dengue in an urban setting: evidence from Hanoi, Vietnam (2018-2022)
10.47665/tb.43.2.011
- Author:
Bui V.H.
;
Nguyen H.N.
;
Le M.D.
;
Hoang N.S.
;
Nguyen V.K.
;
Vu K.T.
;
Nguyen V.A.
- Publication Type:Journal Article
- Keywords:
Dengue;
spatial distribution;
temporal trends;
seasonal variation;
surveillance data.
- From:Tropical Biomedicine
2026;43(No. 2):211-218
- CountryMalaysia
- Language:English
-
Abstract:
Dengue fever remains a major mosquito-borne disease in Southeast Asia, with increasing incidence
in rapidly urbanizing settings. In Vietnam, Hanoi has experienced recurrent outbreaks; however,
comprehensive analyses of recent dengue epidemiology in northern regions remain limited. This
study aimed to characterize the spatiotemporal dynamics of dengue in Hanoi from 2018 to 2022. A
retrospective descriptive study was conducted using routine dengue surveillance data collected by
the Hanoi Center for Disease Control. All clinically diagnosed and laboratory-confirmed dengue cases
reported between January 2018 and December 2022 were included. Temporal trends were examined
using descriptive analysis of monthly and annual incidence rates. District-level incidence rates were
calculated and visualized using a geographic information system (GIS) mapping. Serotype distribution
was examined using available virological data. A total of 46,650 dengue cases were reported during
the study period. Dengue transmission occurred annually, with substantial inter-annual variability; the
highest incidence was recorded in 2022 (236 per 100,000 population), while the lowest occurred in
2021 (41 per 100,000 population). A clear seasonal pattern was observed, with cases increasing from
June and peaking between September and November. Spatial analysis revealed marked heterogeneity,
with higher incidence consistently observed in peri-urban districts. All four dengue virus serotypes
co-circulated, with DENV-1 and DENV-2 predominating and a shift toward DENV-2 dominance in later
years. Dengue transmission in Hanoi exhibits pronounced seasonal and spatial patterns influenced by
urbanization and ecological factors. Strengthening pre-season vector control activities and district-level
surveillance may help reduce outbreak risk and maintaining integrated epidemiological and virological
surveillance is essential to mitigate future outbreaks.
- Full text:202608201105053150Temporal and spatial distribution of dengue in an urban setting evidence from.pdf
