Can Daytime Use of Bed Nets Not Treated with Insecticide Reduce the Risk of Dengue Hemorrhagic Fever Among Children in Vietnam?

Tsuzuki, Ataru; Thiem, Vu Dinh; Suzuki, Motoi; Yanai, Hideki; Matsubayashi, Toru; Yoshida, Lay‐Myint; Tho, Le Huu; Minh, Truong Tan; Anh, Đặng Đức; Kilgore, Paul E.; Takagi, Masahiro; Ariyoshi, Koya

doi:10.4269/ajtmh.2010.09-0724

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…Consistent with other studies, we observed a significant association of both DENV seroprevalence and seroconversion with use of some personal mosquito control measures [11,59–60]. In our evaluation of the effect of personal mosquito control measures on the risk of dengue infection, bed nets appeared to be associated with a lower likelihood of infection than the use of mosquito coils or insecticide sprays, which is consistent with findings reported by others [61]. This pattern might reflect the overall inefficiency of some of these devices (e.g., mosquito coils or sprays) to reduce vector populations, or using them at inappropriate times (i.e., at night rather than in the daylight hours when Ae .…”

Section: Discussionsupporting

confidence: 92%

Dengue seroprevalence, seroconversion and risk factors in Dhaka, Bangladesh

Dhar-Chowdhury¹,

Paul²,

Haque³

et al. 2017

PLoS Negl Trop Dis

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BackgroundDengue virus (DENV) activity has been reported in Dhaka, Bangladesh since the early 1960s with the greatest burden of dengue fever and dengue hemorrhagic fever cases observed in 2000. Since this time, the intensity of dengue activity has varied from year to year, and its determining factors remained relatively unknown. In light of such gaps in knowledge, the main objectives of this study were to determine the magnitude of seroprevalence and seroconversion among the surveyed population, and establish the individual/household level risk factors for the presence of DENV antibodies among all age groups of target populations in the city of Dhaka.Methodology/Principal findingsConsidering the lack of fine scale investigations on the factors driving dengue activity in Bangladesh, a prospective cohort study involving serological surveys was undertaken with participant interviews and blood donation across the city of Dhaka in 2012. Study participants were recruited from 12 of 90 wards and blood samples were collected during both the pre-monsoon (n = 1125) and post-monsoon (n = 600) seasons of 2012. The findings revealed that the seroprevalence in all pre-monsoon samples was 80.0% (900/1125) while the seropositivity in the pre-monsoon samples that had paired post-monsoon samples was 83.3% (503/600). Of the 97 paired samples that were negative at the pre-monsoon time point, 56 were positive at the post-monsoon time point. This resulted in a seroprevalence of 93.2% (559/600) among individuals tested during the post-monsoon period. Seroprevalence trended higher with age with children exhibiting a lower seropositivity as compared to adults. Results from this study also indicated that DENV strains were the only flaviviruses circulating in Dhaka in 2012. A multivariate analysis revealed that age, possession of indoor potted plants, and types of mosquito control measures were significant factors associated with DENV seroprevalence; while attendance in public/mass gatherings, and use of mosquito control measures were significantly associated with DENV seroconversion after adjusting for all other variables.Conclusions/SignificanceOur study suggests that there is a high level of endemic dengue virus circulation in the city of Dhaka which has resulted in significant DENV seroprevalence among its residents. Seropositivity increased with age, however, a substantial proportion of children are at risk for DENV infections. Our serological analysis also documents considerable DENV seroconversion among study participants which indicates that a large proportion of the population in the city of Dhaka were newly exposed to DENV during the study period (pre-and post-monsoon 2012). High levels of seroconversion suggest that there was an intense circulation of DENV in 2012 and this may have resulted in a significant risk for viral associated illness. Findings of our study further indicated that home-based interventions, such as removing indoor potted plants and increased bed net use, in addition to vector control measures in public parks...

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Section: Discussionsupporting

confidence: 92%

Dengue seroprevalence, seroconversion and risk factors in Dhaka, Bangladesh

Dhar-Chowdhury¹,

Paul²,

Haque³

et al. 2017

PLoS Negl Trop Dis

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“…aegypti that come into contact with them, as shown in trials in Haiti [ 60 ]. However, the protective role of bed nets against DENV infections has been debated in the literature, as other studies have failed to find an association between mosquito bed net use and DENV infections [ 61 , 62 ], presumably because Ae . aegypti feeds during the day (morning and afternoon) [ 63 ].…”

Section: Discussionmentioning

confidence: 99%

Social-ecological factors and preventive actions decrease the risk of dengue infection at the household-level: Results from a prospective dengue surveillance study in Machala, Ecuador

et al. 2017

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BackgroundIn Ecuador, dengue virus (DENV) infections transmitted by the Aedes aegypti mosquito are among the greatest public health concerns in urban coastal communities. Community- and household-level vector control is the principal means of controlling disease outbreaks. This study aimed to assess the impact of knowledge, attitudes, and practices (KAPs) and social-ecological factors on the presence or absence of DENV infections in the household.MethodsIn 2014 and 2015, individuals with DENV infections from sentinel clinics in Machala, Ecuador, were invited to participate in the study, as well as members of their household and members of four neighboring households located within 200 meters. We conducted diagnostic testing for DENV on all study participants; we surveyed heads of households (HOHs) regarding demographics, housing conditions and KAPs. We compared KAPs and social-ecological factors between households with (n = 139) versus without (n = 80) DENV infections, using bivariate analyses and multivariate logistic regression models with and without interactions.ResultsSignificant risk factors in multivariate models included proximity to abandoned properties, interruptions in piped water, and shaded patios (p<0.05). Significant protective factors included the use of mosquito bed nets, fumigation inside the home, and piped water inside the home (p<0.05). In bivariate analyses (but not multivariate modeling), DENV infections were positively associated with HOHs who were male, employed, and of younger age than households without infections (p<0.05). DENV infections were not associated with knowledge, attitude, or reported barriers to prevention activities.DiscussionSpecific actions that can be considered to decrease the risk of DENV infections in the household include targeting vector control in highly shaded properties, fumigating inside the home, and use of mosquito bed nets. Community-level interventions include cleanup of abandoned properties, daily garbage collection, and reliable piped water inside houses. These findings can inform interventions to reduce the risk of other diseases transmitted by the Ae. aegypti mosquito, such as chikungunya and Zika fever.

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“…aegypti that come into contact with them, as shown in trials in Haiti [58]. Other studies have failed to find an association between mosquito net use and DENV infections [59,60], presumably because Ae. aegypti feeds during the day (morning and afternoon) [61].…”

Section: Discussionmentioning

confidence: 99%

Social-ecological factors and preventive actions decrease the risk of dengue infection at the household-level: results from a prospective dengue surveillance study in Machala, Ecuador

Kenneson

Beltrán-Ayala

Borbor-Córdova

et al. 2017

Preprint

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BackgroundIn Ecuador, dengue virus (DENV) infections transmitted by the Aedes aegypti mosquito are among the greatest public health concerns in urban coastal communities. Community- and household-level vector control is the principal means of controlling disease outbreaks. This study aimed to assess the impact of knowledge, attitudes, and practices (KAPs) and social-ecological factors on the presence or absence of DENV infections in the household..MethodsIn 2014 and 2015, individuals with DENV infections from sentinel clinics were invited to participate in the study, as well as members of their household and members of four neighboring households located within 200 meters. We conducted diagnostic testing for DENV on all study participants; we surveyed heads of households (HOHs) regarding demographics, housing conditions and KAPs. We compared KAPs and social-ecological factors between households with (n=139) versus without (n=80) DENV infections, using bivariate analyses and multivariate logistic regression models with and without interactions.ResultsSignificant risk factors in multivariate models included proximity to abandoned properties, interruptions in piped water, and shaded patios (p<0.05). Significant protective factors included use of mosquito bed nets, fumigation inside the home, piped water inside the home (p<0.05). In bivariate analyses (but not multivariate modeling), DENV infections was positively associated with HOHs who were male, employed, and of younger age than households without infections (p<0.05). DENV infections were not associated with knowledgeattitude, or reported barriers to prevention activities.DiscussionSpecific actions that can be considered to decrease the risk of DENV infections in the household include targeting vector control in highly shaded properties, fumigating inside the home, and use of mosquito bed nets. Community-level interventions include clean-up of abandoned properties, daily trash pick-up, and reliable piped water inside houses. These findings can inform interventions to reduce the risk of other diseases transmitted by the Ae. aegypti mosquito, such as chikungunya and Zika fever.Author summaryDengue, chikungunya and Zika viruses are transmitted to people primarily by the Aedes aegypti mosquitoes in tropical and subtropical regions. Diseases transmitted by the Ae. aegypti mosquito are a growing public health concern. Mosquito control is the principal means of preventing and controlling disease outbreaks. In this study, we compared the characteristics of households with and without DENV infections in the city of Machala, Ecuador. We found that risk factors for DENV infection included proximity to abandoned properties, interruptions in the piped water supply, and a highly shaded patio. Protective factors included the use of mosquito bed nets, fumigation inside the home, and piped water inside the home. These findings can be used to inform targeted vector control interventions by the public health sector at the household and community levels.

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Can Daytime Use of Bed Nets Not Treated with Insecticide Reduce the Risk of Dengue Hemorrhagic Fever Among Children in Vietnam?

Cited by 11 publications

References 12 publications

Dengue seroprevalence, seroconversion and risk factors in Dhaka, Bangladesh

Dengue seroprevalence, seroconversion and risk factors in Dhaka, Bangladesh

Social-ecological factors and preventive actions decrease the risk of dengue infection at the household-level: Results from a prospective dengue surveillance study in Machala, Ecuador

Social-ecological factors and preventive actions decrease the risk of dengue infection at the household-level: results from a prospective dengue surveillance study in Machala, Ecuador

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