Temporal trends and climatic factors associated with bacterial enteric diseases in Vietnam, 1991–2001
Open accessAbstract
Objective: In Vietnam, shigellosis/dysentery, typhoid fever, and cholera are important enteric diseases. To better understand their epidemiology, we determined temporal trends, seasonal patterns, and climatic factors associated with high risk periods in eight regions across Vietnam. Methods: We quantified monthly cases and incidence rates (IR) for each region from national surveillance data (1991–2001). High- and low-disease periods were defined from the highest and lowest IRs (1 SD above and below the mean) and from outbreaks from positive outliers (4 SDs higher in 1 month or 2 SDs higher in ≥ 2 consecutive months). We used general linear models to compare precipitation, temperature, and humidity between high- and low-risk periods. Results: Shigellosis/dysentery was widespread and increased 2.5 times during the study period, with the highest average IRs found between June and August (2.1/100,000–26.2/100,000). Typhoid fever was endemic in the Mekong River Delta and emerged in the Northwest in the mid-1990s, with peaks between April and August (0.38–8.6). Cholera was mostly epidemic along the central coast between May and November (0.07–2.7), and then decreased dramatically nationwide from 1997 onward. Significant climate differences were found only between high- and low-disease periods. We were able to define 4 shigellosis/dysentery, 14 typhoid fever, and 8 cholera outbreaks, with minimal geotemporal overlap and no significant climatic associations. Conclusions: In Vietnam, bacterial enteric diseases have distinct temporal trends and seasonal patterns. Climate plays a role in defining high- and low-disease periods, but it does not appear to be an important factor influencing outbreaks.
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Some studies from South Asian countries have identified increased rates of cholera with an increase in temperature.
“Some studies from South Asian countries have identified increased rates of infectious diseases such as diarrhea [64][65][66][67] and cholera [68,69] with an increase in temperature.”
From Heatwaves in South Asia: Characterization, Consequences on Human Health, and Adaptation Strategies (2022) · cites this paper as [68]
The Discussion reports that hotter conditions were associated with higher incidence during high-disease periods, and cholera was among the diseases studied. But the Results (Climate associations) identify significant associations for cholera with precipitation and wet days, not temperature. The study was conducted in Vietnam, which is in Southeast Asia, not South Asia. (LLM, conf=0.86)
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Cites
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“In contrast, cholera decreased dramatically from 1997 onward, and many regions reported no further cases after years of epidemic and endemic activity (Dalsgaard et al. 1999).”
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Heatwaves in South Asia: Characterization, Consequences on Human Health, and Adaptation Strategies
Sharma, A., Andhikaputra, G., & Wang, Y.-C. (2022) · Atmosphere · doi:10.3390/atmos13050734 · Cited by 87 · see citing works
Beggs, P. J., Trueck, S., Linnenluecke, M. K., Bambrick, H., Capon, A. G., Hanigan, I. C., Arriagada, N. B., Cross, T. J., Friel, S., Green, D., et al. (2024) · Medical Journal of Australia · doi:10.5694/mja2.52245 · Cited by 31 · see citing works
- Authors
- Kelly-Hope, L. A., Alonso, W. J., Thiem, V. D., Canh, D. G., Anh, D. D., Lee, H., & Miller, M. A.
- Affiliations
- Division of International Epidemiology and Population Studies, Fogarty International Center, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA
- National Institutes of Health (US)
- National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
- National Institute Of Hygiene And Epidemiology (VN)
- International Vaccine Institute (KR)
- Venue
- Environmental Health Perspectives
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-10-16
- Volume
- 116
- Issue
- 1
- Pages
- 7-12
- ISSN
- 0091-6765 (ISSN-L)
- 1552-9924
- PMC
- PMC2199291
- OpenAlex
- W1993590281
- Cited by
- 62
- References
- 2
- Citations by year
- 2025: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 8 · 2018: 4 · 2017: 7 · 2016: 6 · 2015: 4 · 2014: 8 · 2013: 4 · 2012: 1
- FWCI
- 3.26
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- public-domain
- creativecommons.org/licenses/by/4.0/ (vor, 3727 d)
- Locations
- Environmental Health Perspectives (publishedVersion, public-domain)
- Europe PMC (PubMed Central) (publishedVersion, public-domain)
- PubMed Central (publishedVersion, public-domain)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Food Science › Salmonella and Campylobacter epidemiology
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Climate Change and Health Impacts
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Vibrio bacteria research studies
- Keywords
- shigellosis, dysentery, typhoid fever, cholera, temporal trends, seasonal patterns, climatic factors, precipitation, temperature, humidity, outbreak, incidence rates, Vietnam
- MeSH terms
- Climate, Humans, Risk Factors, Seasons, Time Factors, Vietnam, Incidence, Gram-Negative Bacterial Infections
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