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Infectious Disease: Dengue Fever

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Total 77 results found since Jan 2013.

Larval Temperature-Food Effects on Adult Mosquito Infection and Vertical Transmission of Dengue-1 Virus
Temperature–food interactions in the larval environment can affect life history and population growth of container mosquitoes Aedes aegypti (L.) and Aedes albopictus Skuse, the primary vectors of chikungunya and dengue viruses. We used Ae. aegypti, Ae. albopictus, and dengue-1 virus (DENV-1) from Florida to investigate whether larval rearing temperature can alter the effects of larval food levels on Ae. aegypti and Ae. albopictus life history and DENV-1 infection and vertical transmission. Although we found no effect of larval treatments on survivorship to adulthood, DENV-1 titer, or DENV-1 vertical transmission, rat...
Source: Journal of Medical Entomology - January 12, 2016 Category: Biology Authors: Buckner, E. A., Alto, B. W., Lounibos, L. P. Tags: Population and Community Ecology Source Type: research

Spatial and Temporal Variation in Aedes aegypti and Aedes albopictus (Diptera: Culicidae) Numbers in the Yogyakarta Area of Java, Indonesia, With Implications for Wolbachia Releases
Novel approaches to suppress dengue and other mosquito-borne diseases involve changing the composition of mosquito vector populations, particularly through Wolbachia endosymbionts. The success of these strategies depends on understanding the dynamics of vector populations. In preparation for Wolbachia releases around Yogyakarta, we have studied Aedes populations in five hamlets. Adult monitoring with BioGent-Sentinel (BG-S) traps indicated that hamlet populations had different dynamics across the year; while there was an increase in Aedes aegypti (L.) and Aedes albopictus (Skuse) numbers in the wet season, species abundanc...
Source: Journal of Medical Entomology - January 12, 2016 Category: Biology Authors: Tantowijoyo, W., Arguni, E., Johnson, P., Budiwati, N., Nurhayati, P. I., Fitriana, I., Wardana, S., Ardiansyah, H., Turley, A. P., Ryan, P., ONeill, S. L., Hoffmann, A. A. Tags: Vector-Borne Diseases, Surveillance, Prevention Source Type: research

Temporal genetic stability of Stegomyia aegypti (= Aedes aegypti) populations
Abstract The mosquito Stegomyia aegypti (= Aedes aegypti) (Diptera: Culicidae) is the primary vector of viruses that cause yellow fever, dengue and Chikungunya fever. In the absence of effective vaccines, the reduction of these diseases relies on vector control strategies. The success of these strategies is tightly linked to the population dynamics of target populations. In the present study, 14 collections from St. aegypti populations separated by periods of 1–13 years were analysed to determine their temporal genetic stability. Although temporal structure is discernible in most populations, the degree of temporal diffe...
Source: Medical and Veterinary Entomology - January 7, 2016 Category: Veterinary Research Authors: A. GLORIA‐SORIA, D. A. KELLNER, J. E. BROWN, C. GONZALEZ‐ACOSTA, B. KAMGANG, J. LUTWAMA, J. R. POWELL Tags: Short Communication Source Type: research

Behavioral Response of Aedes aegypti (Diptera: Culicidae) Larvae to Synthetic and Natural Attractants and Repellents
In this study, we evaluated a few compounds in a sensitive behavioral assay with Ae. aegypti larvae. The orientation of larvae to different compounds was surveyed using a performance index (PI). The PI represents the response to each odorant, where a value of +1 is indicative of full attraction and –1 represents complete repulsion. The widely used insect repellent N, N-diethyl-m-toluamide elicited a significantly negative PI, as did acetophenone and indole. A yeast extract, a known food source, elicited a significantly positive PI, as did 2-methylphenol, 1-octen-3-ol, 3-methylphenol, and fish food. On the other hand,...
Source: Journal of Medical Entomology - November 5, 2015 Category: Biology Authors: Gonzalez, P. V., Gonzalez Audino, P. A., Masuh, H. M. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Armigeres subalbatus colonization of damaged pit latrines: a nuisance and potential health risk to residents of resettlement villages in Laos
Abstract During the resettlement of 6500 persons living around the Nam Theun 2 hydroelectric project in Laos, more than 1200 pour‐flush latrines were constructed. To assess the role of these latrines as productive larval habitats for mosquitoes, entomological investigations using Centers for Disease Control (CDC) light traps, visual inspection and emergence trapping were carried out in over 300 latrines during the rainy seasons of 2008–2010. Armigeres subalbatus (Diptera: Culicidae) were nine times more likely to be found in latrines (mean catch: 3.09) than in adjacent bedrooms (mean catch: 0.37) [odds ratio (OR) 9.08,...
Source: Medical and Veterinary Entomology - October 28, 2015 Category: Veterinary Research Authors: A. HISCOX, R. HIROOKA, K. VONGPHAYLOTH, N. HILL, S. W. LINDSAY, M. GRANDADAM, P. T. BREY Tags: Short Communication Source Type: research

Comparison of the Insecticidal Characteristics of Commercially Available Plant Essential Oils Against Aedes aegypti and Anopheles gambiae (Diptera: Culicidae)
Aedes aegypti and Anopheles gambiae are two mosquito species that represent significant threats to global public health as vectors of Dengue virus and malaria parasites, respectively. Although mosquito populations have been effectively controlled through the use of synthetic insecticides, the emergence of widespread insecticide-resistance in wild mosquito populations is a strong motivation to explore new insecticidal chemistries. For these studies, Ae. aegypti and An. gambiae were treated with commercially available plant essential oils via topical application. The relative toxicity of each essential oil was determined, as...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Norris, E. J., Gross, A. D., Dunphy, B. M., Bessette, S., Bartholomay, L., Coats, J. R. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Sterol Carrier Protein 2, a Critical Host Factor for Dengue Virus Infection, Alters the Cholesterol Distribution in Mosquito Aag2 Cells
In this study, we identified SCP-2 as a critical host factor for DENV production in mosquito Aag2 cells. Treatment with a small molecule commonly referred to as SCPI-1, (N-(4-{[4-(3,4-dichlorophenyl)-1,3-thiazol-2-yl]amino}phenyl)acetamide hydrobromide, a known inhibitor of SCP-2, or knockdown of SCP-2 dramatically repressed the virus production in mosquito but not mammalian cells. We showed that the intracellular cholesterol distribution in mosquito cells was altered by SCP-2 inhibitor treatment, suggesting that SCP-2-mediated cholesterol trafficking pathway is important for DENV viral production. A comparison of the effe...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Fu, Q., Inankur, B., Yin, J., Striker, R., Lan, Q. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Testing the impact of virus importation rates and future climate change on dengue activity in Malaysia using a mechanistic entomology and disease model
Research Articles C. R. WILLIAMS, B. S. GILL, G. MINCHAM, A. H. MOHD ZAKI, N. ABDULLAH, W. R. W. MAHIYUDDIN, R. AHMAD, M. K. SHAHAR, D. HARLEY, E. VIENNET, A. AZIL, A. KAMALUDDIN, Epidemiology & Infection, Volume 143 Issue 13, pp 2856-2864Abstract
Source: Epidemiology and Infection - September 1, 2015 Category: Epidemiology Source Type: research

Imidacloprid impairs the post‐embryonic development of the midgut in the yellow fever mosquito Stegomyia aegypti (=Aedes aegypti)
Abstract The mosquito Stegomyia aegypti (=Aedes aegypti) (Diptera: Culicidae) is a vector for the dengue and yellow fever viruses. As blood digestion occurs in the midgut, this organ constitutes the route of entry of many pathogens. The effects of the insecticide imidacloprid on the survival of St. aegypti were investigated and the sub‐lethal effects of the insecticide on midgut development were determined. Third instar larvae were exposed to different concentrations of imidacloprid (0.15, 1.5, 3.0, 6.0 and 15.0 p.p.m.) and survival was monitored every 24 h for 10 days. Midguts from imidacloprid‐treated insects...
Source: Medical and Veterinary Entomology - May 13, 2015 Category: Veterinary Research Authors: K. M. FERNANDES, W. G. GONZAGA, T. V. PASCINI, F. R. MIRANDA, H. V. V. TOMÉ, J. E. SERRÃO, G. F. MARTINS Tags: Original Article Source Type: research

Describing the Breakbone Fever: IDODEN, an Ontology for Dengue Fever
Conclusions/Significance The availability of the dengue ontology will enable databases hosting dengue-associated data and decision-support systems for that disease to perform most efficiently and to link their own data to those stored in other independent repositories, in an architecture- and software-independent manner.
Source: PLoS Neglected Tropical Diseases - February 3, 2015 Category: Tropical Medicine Authors: Elvira Mitraka et al. Source Type: research

Social sustainability of Mesocyclops biological control for dengue in South Vietnam.
Abstract Copepod Mesocyclops as biological control agents for dengue was previously proven to be effective and sustainable in the Northern and Central provinces of Vietnam. We aim to study social sustainability of Mesocyclops intervention in south Vietnam. Both quantitative and qualitative approaches were used. An entomological survey was carried out in 100 random households of Chanh An commune, Vinh Long Province. Aedes larval indices and Mesocyclops prevalence were compared with historical pre- and post-intervention values. In the same commune, using purposeful sampling, sixteen semi-structured interviews (1 vil...
Source: Acta Tropica - October 10, 2014 Category: Infectious Diseases Authors: Tran TT, Olsen A, Viennet E, Sleigh A Tags: Acta Trop Source Type: research

Multi‐scale analysis of the associations among egg, larval and pupal surveys and the presence and abundance of adult female Aedes aegypti (Stegomyia aegypti) in the city of Merida, Mexico
This study reports the results of a multi‐scale, cross‐sectional entomological survey carried out in 1160 households in the city of Merida, Mexico to establish: (a) the correlation between levels of Ae. aegypti presence and abundance detected with aspirators and ovitraps; (b) which immature and egg indices correlate with the presence and abundance of Ae. aegypti females, and (c) the correlations amongst traditional Aedes indices and their modifications for pupae at the household level and within medium‐sized geographic areas used for vector surveillance. Our analyses show that ovitrap positivity was significantly ass...
Source: Medical and Veterinary Entomology - May 6, 2014 Category: Veterinary Research Authors: P. MANRIQUE‐SAIDE, P. COLEMAN, P. J. MCCALL, A. LENHART, G. VÁZQUEZ‐PROKOPEC, C. R. DAVIES Tags: ORIGINAL ARTICLE Source Type: research

Field evaluation of the response of Aedes albopictus (Stegomyia albopicta) to three oviposition attractants and different ovitrap placements using black and clear autocidal ovitraps in a rural area of Same, Timor‐Leste
Abstract Known oviposition attractants or stimulants were compared, singly and in combination, using inexpensive autocidal ovitraps designed to trap emerging adults, in a rural area of Timor‐Leste during the dry season. In this area, the dengue vector Aedes albopictus (Stegomyia albopicta) Skuse (Diptera: Culicidae) was abundant, but Aedes aegypti (Stegomyia aegypti) L. was not detected. The attractants were: (a) a compound found in Aedes eggs (dodecanoic acid); (b) components of nitrogen, phosphorous and potassium‐based (NPK) fertilizer, and (c) infusions of discarded cigarette butts. A solution of ammonium phosphate ...
Source: Medical and Veterinary Entomology - March 1, 2014 Category: Veterinary Research Authors: E. M. ANDERSON, J. A. DAVIS Tags: Original Article Source Type: research

Wolbachia infection does not alter attraction of the mosquito Aedes (Stegomyia) aegypti to human odours
Abstract The insect endosymbiont Wolbachia pipientis (Rickettsiales: Rickettsiaceae) is undergoing field trials around the world to determine if it can reduce transmission of dengue virus from the mosquito Stegomyia aegypti to humans. Two different Wolbachia strains have been released to date. The primary effect of the wMel strain is pathogen protection whereby infection with the symbiont limits replication of dengue virus inside the mosquito. A second strain, wMelPop, induces pathogen protection, reduces the adult mosquito lifespan and decreases blood feeding success in mosquitoes after 15 days of age. Here we test whethe...
Source: Medical and Veterinary Entomology - March 1, 2014 Category: Veterinary Research Authors: A. P. TURLEY, R. C. SMALLGANGE, W. TAKEN, M. P. ZALUCKI, S. L. O'NEILL, E. A. MCGRAW Tags: Short Communication Source Type: research

Diet of hookworms to tackle a bread allergy
James Logan, a biologist at the School of Hygiene and Tropical Medicine also tried leeches and is thinking about maggot therapy• Read about more scientists who go to extremes lengthsA lot of people don't realise that just one metre below your feet walking along Gower Street or Malet Street in London, you have thousands upon thousands of very hungry, potentially dangerous insects.In the basement we have our insectary colonies where we keep lots of different species of mosquitoes, found in all parts of the world. None of them are infected with malaria, but they are in very high numbers. We also have bed bugs, house dust mi...
Source: Guardian Unlimited Science - December 1, 2013 Category: Science Authors: Josh Davis Tags: Allergies Health Medical research Society Technology Features Animals Insects The Observer Environment Science Wildlife Source Type: news