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Waewwab P, Sungvornyothin S, Potiwat R, Okanurak K. Impact of dengue-preventive behaviors on Aedes immature production in Bang Kachao, Samut Prakan Province, Thailand: a cross-sectional study. BMC Public Health 2020; 20:905. [PMID: 32527239 PMCID: PMC7291577 DOI: 10.1186/s12889-020-8394-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 02/24/2020] [Indexed: 11/13/2022] Open
Abstract
Background Controlling sites where mosquitos breed is a key strategy in breaking the cycle of infectious transmission of the dengue virus. Preventive behaviors, such as covering water containers with lids and adding temephos (commercially named Abate sand) in water containers are needed to reduce and control mosquito breeding sites. This study aimed to investigate the impact of dengue-preventive behaviors on Aedes immature production. Methods This cross-sectional study used in-person interviews to record occurrence of dengue-preventive behaviors in Bang Kachao, Samut Prakan Province, Thailand. Larval mosquitos in and around houses were observed and recorded, and covered 208 households. Results It was found that 50% of these households had containers for drinking water and 94% used water containers. Covering water containers with effective lids showed the best success among dengue-preventive behaviors for reducing Aedes immature production. Adding temephos in water containers also was effective. Conclusions Such behaviors substantively affected development of Aedes immatures in and around households.
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Affiliation(s)
- Pathavee Waewwab
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Sungsit Sungvornyothin
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand.
| | - Rutcharin Potiwat
- Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand
| | - Kamolnetr Okanurak
- Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok, 10400, Thailand.
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Huang YW, Lee CT, Wang TC, Kao YC, Yang CH, Lin YM, Huang KS. The Development of Peptide-based Antimicrobial Agents against Dengue Virus. Curr Protein Pept Sci 2018; 19:998-1010. [PMID: 29852867 PMCID: PMC6446661 DOI: 10.2174/1389203719666180531122724] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 05/25/2018] [Indexed: 11/22/2022]
Abstract
Dengue fever has become an imminent threat to international public health because of global warming and climate change. The World Health Organization proclaimed that more than 50% of the world's population is at risk of dengue virus (DENV) infection. Therefore, developing a clinically approved vaccine and effective therapeutic remedy for treating dengue fever is imperative. Peptide drug development has become a novel pharmaceutical research field. This article reviews various peptidesbased antimicrobial agents targeting three pathways involved in the DENV lifecycle. Specifically, they are peptide vaccines from immunomodulation, peptide drugs that inhibit virus entry, and peptide drugs that interfere with viral replication. Many antiviral peptide studies against DENV have been conducted in animal model trials, and progression to clinical trials for these promising peptide drugs is anticipated.
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Affiliation(s)
| | | | | | | | | | | | - Keng-Shiang Huang
- Address correspondence to this author at the School of Chinese Medicine for Post-Baccalaureate, I-Shou University, Kaohsiung, Taiwan;, Tel: +886-988-399-979; E-mail:
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Basker P, Kolandaswamy KG. Study on the Behavior of Dengue Viruses during Outbreaks with Reference to Entomological and Laboratory Surveillance in the Cuddalore, Nagapattinam, and Tirunelveli Districts of Tamil Nadu, India. Osong Public Health Res Perspect 2015; 6:143-58. [PMID: 27606255 PMCID: PMC4986583 DOI: 10.1016/j.phrp.2015.05.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 02/20/2015] [Accepted: 02/21/2015] [Indexed: 12/02/2022] Open
Abstract
Objectives This study was carried out in order to understand the behavior of dengue viruses through the entomological and laboratory surveillance of outbreaks. The aim of the study was to provide additional research to support current knowledge of epidemiological, clinical, and laboratory diagnosis of dengue virus and ultimately to use this information to forecast dengue as well as to justify intervention measures. Methods Data on the presence of Aedes larvae in human dwellings during the entomological surveillance in Cuddalore, Nagapattinam, and Tirunelveli dengue outbreaks were taken to compute indices, namely the House Index (HI), Container index (CI), and the Breteau Index (BI). Standard procedures were followed for nonstructural Protein 1 (NS1) and immunoglobulin M enzyme linked immunosorbent assay for the confirmation of dengue. Serovar confirmation was made in the Kottayam field station of the Vector Control Research Center, Puducherry. Results Larval indices HI < 2–3% and BI < 20 contributed to halting the outbreak. Incubation of the dengue viruses in humans was detected at 15 days, NS1 was identified as a tool for the early diagnosis of dengue cases and its presence indicated the need to implement all available interventions. It was also discovered that it is helpful to search for hidden habitats of Aedes when dengue cases have not been reduced even after the sustainable management of the larval indices, HI < 5% and BI < 20. Based on the observed incidences of stopping dengue outbreaks, it was learnt that neighborhood areas of the outbreak villages, around 400 m, should have permissible larval indices < 5% HI and BI < 20. Heterogeneous serovars that led to dengue hemorrhagic fever and Dengue Shock Syndrome (DSS) were identified using reverse transcription polymerase chain reaction and reconfirmed in the field as DEN-1 and DEN-3 viruses and were circulating in Tirunelveli during the outbreak. Conclusion The behaviors of dengue viruses experienced in experimental, clinical, epidemiological, entomological, and laboratory surveillance did not deviate from observations in the field during dengue outbreaks in the Cuddalore, Nagapattinam, and Tirunelveli districts of Tamil Nadu, India.
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Purification and expression of glutathione S-transferase from a Malaysian population of Aedes albopictus (Diptera: Culicidae). Biologia (Bratisl) 2014. [DOI: 10.2478/s11756-014-0342-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Estallo EL, Ludueña-Almeida FF, Visintin AM, Scavuzzo CM, Introini MV, Zaidenberg M, Almirón WR. Prevention of Dengue Outbreaks Through Aedes aegypti Oviposition Activity Forecasting Method. Vector Borne Zoonotic Dis 2011; 11:543-9. [DOI: 10.1089/vbz.2009.0165] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Elizabet L. Estallo
- Centro de Investigaciones Entomológicas de Córdoba, Edificio de Investigaciones Biológicas y Tecnológicas, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Francisco F. Ludueña-Almeida
- Centro de Investigaciones Entomológicas de Córdoba, Edificio de Investigaciones Biológicas y Tecnológicas, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Andrés M. Visintin
- Centro de Investigaciones Entomológicas de Córdoba, Edificio de Investigaciones Biológicas y Tecnológicas, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Carlos M. Scavuzzo
- Instituto de Altos Estudios Espaciales Mario Gulich, Comisión Nacional de Actividades Espaciales (CONAE), Centro Espacial Teófilo Tabanera, Córdoba, Argentina
| | | | | | - Walter R. Almirón
- Centro de Investigaciones Entomológicas de Córdoba, Edificio de Investigaciones Biológicas y Tecnológicas, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Córdoba, Argentina
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Dieng H, Saifur RGM, Hassan AA, Salmah MRC, Boots M, Satho T, Jaal Z, AbuBakar S. Indoor-breeding of Aedes albopictus in northern peninsular Malaysia and its potential epidemiological implications. PLoS One 2010; 5:e11790. [PMID: 20668543 PMCID: PMC2910701 DOI: 10.1371/journal.pone.0011790] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2010] [Accepted: 06/22/2010] [Indexed: 12/01/2022] Open
Abstract
Background The mosquito Ae. albopictus is usually adapted to the peri-domestic environment and typically breeds outdoors. However, we observed its larvae in most containers within homes in northern peninsular Malaysia. To anticipate the epidemiological implications of this indoor-breeding, we assessed some fitness traits affecting vectorial capacity during colonization process. Specifically, we examined whether Ae. albopictus exhibits increased survival, gonotrophic activity and fecundity due to the potential increase in blood feeding opportunities. Methodology/Principal Findings In a series of experiments involving outdoors and indoors breeding populations, we found that Ae. albopictus lives longer in the indoor environment. We also observed increased nighttime biting activity and lifetime fecundity in indoor/domestic adapted females, although they were similar to recently colonized females in body size. Conclusion/Significance Taken together these data suggest that accommodation of Ae. albopictus to indoor/domestic environment may increase its lifespan, blood feeding success, nuisance and thus vectorial capacity (both in terms of increased vector-host contacts and vector population density). These changes in the breeding behavior of Ae. albopictus, a potential vector of several human pathogens including dengue viruses, require special attention.
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Affiliation(s)
- Hamady Dieng
- School of Biological Sciences, Universiti Sains Malaysia, Penang, Malaysia.
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Guzman MG, Hermida L, Bernardo L, Ramirez R, Guillén G. Domain III of the envelope protein as a dengue vaccine target. Expert Rev Vaccines 2010; 9:137-47. [PMID: 20109025 DOI: 10.1586/erv.09.139] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A dengue vaccine should induce long-lasting, simultaneous protection to the four dengue viruses while avoiding the immune enhancement of viral infection. Domain III of the dengue envelope protein has been implicated in receptor binding, and is also the target of specific neutralizing antibodies. Domain III has emerged as a promising region for a subunit vaccine candidate. Here, we review the current state of knowledge on vaccine candidates based on domain III. Due to the results obtained concerning the immune response and protection in mice and monkeys, particular attention is paid to the chimeric protein domain III fused to p64k of Neisseria meningitidis.
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Affiliation(s)
- Maria G Guzman
- Department of Virology, PAHO/WHO Collaborating Center for the Study of Dengue and its Vector, Pedro Kouri Tropical Medicine Institute, Autopista Novia del Mediodía, Km 6, Apdo 601, Marianao 13, Havana, Cuba.
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Sanchez L, Perez D, Cruz G, Castro M, Kourí G, Shkedy Z, Vanlerberghe V, Van der Stuyft P. Intersectoral coordination, community empowerment and dengue prevention: six years of controlled interventions in Playa Municipality, Havana, Cuba. Trop Med Int Health 2009; 14:1356-64. [PMID: 19840350 DOI: 10.1111/j.1365-3156.2009.02379.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To document the process, outcome and effectiveness of a community-based intervention for dengue control. METHODS The primary intervention, focused on strengthening intersectoral coordination, was initiated by researchers in January 2000 in a pilot area in Playa municipality, Havana. In August 2002 health authorities extended the intervention to neighbouring areas, one of which was selected for evaluation. In August 2003 a complementary strategy, focused on community empowerment, was initiated in half of the pilot area. In our control area, routine dengue activities continued throughout the study period. Longitudinal process assessment was carried out using document analysis, interviews and group discussions. Random population surveys in 1999, 2002 and 2005 assessed levels of participation and behavioural changes. Entomological surveillance data from 1999 to 2005 were used to determine effectiveness. RESULTS Mean scores for participation in the pilot area were 1.6, 3.4 and 4.4 at baseline, and 2 years after initiating intersectoral coordination and intersectoral coordination plus community empowerment interventions, respectively. While in the control area little behavioural change was observed over time, changes were considerable in the pilot and extension areas, with 80% of households involved in the community empowerment intervention showed adequate behavioural patterns. The pilot and extension areas attained comparable entomological effectiveness with significantly lower Breteau indices (BIs) than the control area. The pilot (sub-) area with the community empowerment intervention reached BIs below 0.1 that continued to be significantly lower than the one in the control area until the end of the study. CONCLUSION The study showed a trend in the levels and quality of participation, behavioural change and effectiveness of Aedes control from the routine activities only over an intervention with intersectoral coordination to one that combined intersectoral coordination and community empowerment approach.
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Affiliation(s)
- L Sanchez
- Institute of Tropical Medicine "Pedro Kouri", Havana City, Cuba.
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Amexis G, Young NS. Multiple antigenic peptides as vaccine platform for the induction of humoral responses against dengue-2 virus. Viral Immunol 2008; 20:657-63. [PMID: 18158738 DOI: 10.1089/vim.2007.0029] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Dengue is an important agent of human disease for which no licensed vaccine is available to the public. We used multiple antigenic peptides (MAPs) as an antigen carrier for the development of subunit vaccines against dengue-2 virus (DEN-2). Commercially available software (MacVector 7.0) was used to identify potential antigenic B-cell epitopes of E-glycoprotein. A total of 60 BALB/c mice were immunized with 12 recombinant DEN-2-specific MAPs and the humoral immune response was assessed by anti-DEN-2 ELISA and PRNT50 assays. Anti-DEN-2 ELISA showed high levels of anti-DEN-2 antibodies and post-immune sera reduced viral infectivity and prevented infection of monkey kidney cells (LLC-MK2) with live DEN-2 virus. Seven neutralizing DEN-2 epitopes were identified that generated PRNT50 titers of up to 1:160. Our findings show that the MAP platform can be used as an antigen-presenting platform for dengue vaccine development.
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Affiliation(s)
- Georgios Amexis
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
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Bernardo L, Hermida L, Martin J, Alvarez M, Prado I, López C, Martínez R, Rodríguez-Roche R, Zulueta A, Lazo L, Rosario D, Guillén G, Guzmán MG. Anamnestic antibody response after viral challenge in monkeys immunized with dengue 2 recombinant fusion proteins. Arch Virol 2008; 153:849-54. [PMID: 18299795 DOI: 10.1007/s00705-008-0050-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Accepted: 12/14/2007] [Indexed: 12/30/2022]
Abstract
The suitability of dengue 2 envelope domain III recombinant fusion proteins [(fusion (PD5) and insertion (PD3) variants)] for inducing functional antibodies and a protective immune response in nonhuman primates has been reported. However, the evaluation of the antibody response after immunization did not correlate with the protection data as measured by viremia detection. Here, we characterized the anamnestic immune response after viral challenge in monkeys immunized with the dengue 2 recombinant proteins in an attempt to define correlates of protection useful for vaccine studies. Monkeys immunized with PD5 (most protected group) exhibited an earlier increase in the anti-DENV-2 IgM response after challenge compared to control animals. Hemagglutination-inhibiting (HAI) antibodies were increased significantly earlier in PD5-immunized animals compared to those immunized with PD3. The fully protected monkeys showed the earliest HAI antibody response. These results underline the usefulness of the anamnestic antibody response for supporting protection data. The induction of an early HAI and IgM antibody response after challenge suggest a protective role against dengue virus (DENV) infection in monkeys, supporting their use as correlates of protection in vaccine studies.
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Affiliation(s)
- Lidice Bernardo
- PAHO/WHO Collaborating Center for Viral Diseases, Department of Virology, Pedro Kourí Tropical Medicine Institute IPK, Autopista Novia del Mediodía, km 6 1/2, PO Box 601, Marianao 13, Havana, Cuba
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Sanchez L, Vanlerberghe V, Alfonso L, Marquetti MDC, Guzman MG, Bisset J, van der Stuyft P. Aedes aegypti larval indices and risk for dengue epidemics. Emerg Infect Dis 2006; 12:800-6. [PMID: 16704841 PMCID: PMC3374431 DOI: 10.3201/eid1205.050866] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Entomologic indices can identify areas at high risk for disease transmission. We assessed in a case-control study the test-validity of Aedes larval indices for the 2000 Havana outbreak. "Cases" were blocks where a dengue fever patient lived during the outbreak. "Controls" were randomly sampled blocks. Before, during, and after the epidemic, we calculated Breteau index (BI) and house index at the area, neighborhood, and block level. We constructed receiver operating characteristic (ROC) curves to determine their performance as predictors of dengue transmission. We observed a pronounced effect of the level of measurement. The BImax (maximum block BI in a radius of 100 m) at 2-month intervals had an area under the ROC curve of 71%. At a cutoff of 4.0, it significantly (odds ratio 6.00, p<0.05) predicted transmission with 78% sensitivity and 63% specificity. Analysis of BI at the local level, with human-defined boundaries, could be introduced in control programs to identify neighborhoods at high risk for dengue transmission.
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Affiliation(s)
- Lizet Sanchez
- Department of Informatics and Biostatistics, Pedro Kouri Tropical Medicine Institute, Autopista Novia del Mediodia, Km 6, La Lisa AP 601, Marianao 13, Havana City, Havana AP 601, Cuba.
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