Heatwaves and dengue outbreaks in Hanoi, Vietnam: New evidence on early warning

This study aimed to compare the short-term temperature-dengue associations during different dengue outbreak periods, estimate the den gue cases attributable to temperature, and ascertain if there was an association between heatwaves and dengue outbreaks in Hanoi, Vietnam. Methodology/Principal findingsDengue outbreaks were assigned to one of three categories (small, medium and large) based on the 50th, 75th, and 90th percentiles of distribution of weekly dengue cases during 2008 –2016. Using a generalised linear regression model with a negative binomial link that controlled for temporal trends, temperature variation, rainfall and population size over time, we examined and compared associations between weekly average temperature and weekly dengue incidence for different ou tbreak categories. The same model using weeks with or without heatwaves as binary variables was applied to examine the potential effects of extreme heatwaves, defined as seven or more days with temperatures above the 95th percentile of daily temperature distribution during the study period. This stu dy included 55,801 dengue cases, with an average of 119 (range: 0 to 1454) cases per week. The exposure-response relationship between temperature and dengue risk was non-linear and differed with dengue category. After considering the delayed effects of temperature (one week lag), we estimated that 4 .6%, 11.6%, and 21.9% of incident cases during small, medium, and large outbreaks were attributable to temper...
Source: PLoS Neglected Tropical Diseases - Category: Tropical Medicine Authors: Source Type: research

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Conclusion: Almost all the women in our study showed serological evidence of Dengue immunity, suggesting that microcephaly can occur in DENV immune mothers. T cell immunity to Zika virus showed a multifunctional response to the antigens Env and NS1 and immune regulatory responses to NS5 and C protein. Our data support an argument that different viral products may skew the antiviral response to a more pro or anti-inflammatory outcome, with an associated impact on immunopathogenesis.
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
Conclusion: These results suggest that if no vector control measures are considered to be in place, the risk of new arboviral outbreaks in Cabo Verde is high. The vector control strategy adopted must include measures of public health directed to domestic water storage and management.
Source: International Journal of Environmental Research and Public Health - Category: Environmental Health Authors: Tags: Article Source Type: research
Paraguay health officials said on Friday that deaths from dengue fever increased to 16 in the South American country's worst outbreak of the disease in the last decade, severely straining its health system.
Source: Reuters: Health - Category: Consumer Health News Tags: healthNews Source Type: news
Dengue virus (DENV) infects hundreds of thousands of people annually in Indonesia. However, DENV sequence data from the country are limited, as samples from outbreaks must be shipped across long-distances to s...
Source: Virology Journal - Category: Virology Authors: Tags: Research Source Type: research
CONCLUSIONS: To prevent or mitigate the spread of future arboviral introductions and outbreaks, the public health response should focus on behavioral and cultural attitudes, emphasizing personal mosquito protection and mosquito control at the community level. Outbreak responses can also be enhanced through the use of advanced GIS techniques, such as hot-spot analysis, to provide situational awareness and guide response efforts. PMID: 32040922 [PubMed - as supplied by publisher]
Source: Public Health Reports - Category: International Medicine & Public Health Tags: Public Health Rep Source Type: research
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Source: Infectious Diseases - Category: Infectious Diseases Authors: Source Type: research
Abstract A dengue outbreak occurred on Hawaii Island between September 2015 and March 2016. Entomological investigations were undertaken between December 2015 and February 2016 to determine which Aedes mosquito species were responsible for the outbreak. A total of 3,259 mosquitoes were collected using a combination of CDC autocidal gravid ovitraps, Biogents BG-Sentinel traps, and hand-nets; immature mosquitoes were collected during environmental surveys. The composition of species was Aedes albopictus (58%), Aedes aegypti (25%), Wyeomyia mitchelli (7%), Aedes vexans (5%), Culex quinquefasciatus (4%), and Aedes jap...
Source: The American Journal of Tropical Medicine and Hygiene - Category: Tropical Medicine Authors: Tags: Am J Trop Med Hyg Source Type: research
Conclusion: Dengue transmission appears sensitive to climatic variability. Elucidating the role of climatic factors in dengue fever helps in risk assessment and prevention of epidemics. PMID: 32003443 [PubMed - in process]
Source: Eastern Mediterranean Health Journal - Category: Middle East Health Tags: East Mediterr Health J Source Type: research
Abstract The recent outbreaks of mosquito-borne diseases (e.g., zika, dengue, and chikungunya) increased public health burden in developing countries. To control the spread of these infectious diseases, a simple, economic, reliable, sensitive, and selective diagnostic platform is required. Considering demand for affordable and accessible methods, we have demonstrated a two-step strategy for extraction and detection of viral RNAs of infectious diseases within 1 h. Ready-to-use devices for viral RNA extraction and detection were successfully fabricated using paper as a substrate. Viral RNA (e.g., zika, dengue, ...
Source: Biosensors and Bioelectronics - Category: Biotechnology Authors: Tags: Biosens Bioelectron Source Type: research
This study aimed to assess the knowledge and attitudes of nursing students regarding DF and the effectiveness of an education intervention to improve students' knowledge and attitude. An intervention study was conducted among 4th year nursing students of Tanta Faculty of Nursing using a self-administered predesigned validated questionnaire before and after introducing an educational session. The main DF information sources were formal teaching, social networks, television, and physicians. Less than half of the students (45.5%) had "good" knowledge grade after the intervention compared with only 7.2% in the pre-te...
Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Tags: Environ Sci Pollut Res Int Source Type: research
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