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Infectious Disease: Dengue Fever

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Total 77 results found since Jan 2013.

Vector competence and innate immune responses to dengue virus infection in selected laboratory and field ‐collected Stegomyia aegypti (= Aedes aegypti)
Abstract Control of dengue virus (DenV) transmission, primarily based on strategies to reduce populations of the principle vector Stegomya aegypti (= Aedes aegypti) (Diptera: Culicidae), is difficult to sustain over time. Other potential strategies aim to manipulate characteristics such as vector competence (VC), the innate capacity of the vector to transmit the virus. Previous studies have identified genetic factors, including differential expression of apoptosis‐related genes, associated with the refractory and susceptible phenotypes in selected strains of S. aegypti from Cali, Colombia. The present study was desig...
Source: Medical and Veterinary Entomology - March 1, 2017 Category: Veterinary Research Authors: I. M. SERRATO, P. A. CAICEDO, Y. OROBIO, C. LOWENBERGER, C. B. OCAMPO Tags: Original Article Source Type: research

Toxicity and Larvicidal Activity of Podophyllum-Based Lignans Against Aedes aegypti (Diptera: Culicidae)
This study had the aim of evaluating the larvicidal activity of an ethanolic extract from the rhizomes and roots of Podophyllum hexandrum (PM-3) and its isolated lignans, podophyllotoxone (1) and desoxypodophyllotoxin (2), on the larvae of the mosquito vector Ae. aegypti. The PM-3 extract and the compounds (1) and (2) were dissolved in a mixture of acetone and dimethylsulfoxide at final concentrations of 1, 10, 30, 50, 100, and 200 μg/ml. After dilution, the solutions were applied (μg/ml) to the larvae-rearing medium. Overall, the ethanolic extract from the rhizomes and roots of P. hexandrum and the compounds (1) and...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: Maleck, M., Hollanda, P. d. O., Serdeiro, M. T., Soares, R. O. d. A., Honorio, N. A., Silva, C. G. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Aedes aegypti (Diptera: Culicidae) Longevity and Differential Emergence of Dengue Fever in Two Cities in Sonora, Mexico
Dengue virus, primarily transmitted by the Aedes aegypti (L.) mosquito, has rapidly expanded in geographic extent over the past several decades. In some areas, however, dengue fever has not emerged despite established Ae. aegypti populations. The reasons for this are unclear and have sometimes been attributed to socio-economic differences. In 2013 we compared Ae. aegypti adult density and population age structure between two cities in Sonora, Mexico: Hermosillo, which has regular seasonal dengue virus transmission, and Nogales, which has minimal transmission. Larval and pupal abundance was greater in Nogales, and adult den...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: Ernst, K. C., Walker, K. R., Reyes-Castro, P., Joy, T. K., Castro-Luque, A. L., Diaz-Caravantes, R. E., Gameros, M., Haenchen, S., Hayden, M. H., Monaghan, A., Jeffrey-Guttierez, E., Carriere, Y., Riehle, M. R. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Vectors: Aedes Albopictus
European Union, European Centre for Disease Prevention and Control. 12/20/2016 This resource provides information about the Aedes albopictus mosquito, a known vector of chikungunya virus, dengue virus, and dirofilariasis, and a potential vector of Zika virus. It discusses the hazard associated with the mosquito species, geographical distribution, entomology, epidemiology and transmission of pathogens, public health (control/intervention), and key areas of uncertainty. (Text)
Source: Disaster Lit: Resource Guide for Disaster Medicine and Public Health - January 4, 2017 Category: Global & Universal Authors: The U.S. National Library of Medicine Source Type: news

Knockdown Resistance Mutations in Aedes aegypti (Diptera: Culicidae) From Puerto Rico
This study assessed the levels of permethrin resistance and the frequency of two kdr mutations in eight Ae. aegypti populations collected in Puerto Rico in 2013. Permethrin resistance factors ranged from 33–214-fold relative to the New Orleans reference strain. The frequency of kdr mutation Ile1,016 ranged from 0.65 to fixation (1.0), and for Cys1,534 frequencies varied from 0.8 to fixation. Alarmingly, two populations—Carolina and Caguas—reached fixation at both loci. Our results suggest that permethrin effectiveness for Ae. aegypti control is compromised in these collections from Puerto Rico.
Source: Journal of Medical Entomology - November 11, 2016 Category: Biology Authors: Ponce-Garcia, G., Del Rio-Galvan, S., Barrera, R., Saavedra-Rodriguez, K., Villanueva-Segura, K., Felix, G., Amador, M., Flores, A. E. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Florida Sees Second Local Dengue Case This Year
By Laura Geggel A person in Florida has caught a locally transmitted case of dengue fever, news sources reported Wednesday. The case is the first in which a person caught dengue from a mosquito bite within Miami-Dade County in 2016. The person diagnosed with the viral infection has received treatment and is expected to fully recover, CBS Miami reported. The case is also Florida’s second local dengue case of 2016, according to CBS Miami. In 2015, the state reported one locally transmitted case of dengue, and in 2014 it had six known locally acquired cases of the disease, according to the Florida Department of Health....
Source: Healthy Living - The Huffington Post - September 29, 2016 Category: Consumer Health News Source Type: news

The Eye of the Tiger, the Thrill of the Fight: Effective Larval and Adult Control Measures Against the Asian Tiger Mosquito, Aedes albopictus (Diptera: Culicidae), in North America
The Asian tiger mosquito, Aedes albopictus (Skuse), is a highly invasive container-inhabiting species with a global distribution. This mosquito, similar to other Stegomyia species such as Aedes aegypti (L.), is highly adapted to urban and suburban areas, and commonly oviposits in artificial containers, which are ubiquitous in these peridomestic environments. The increase in speed and amount of international travel and commerce, coupled with global climate change, have aided in the resurgence and expansion of Stegomyia species into new areas of North America. In many parts of their range, both species are implicated as sign...
Source: Journal of Medical Entomology - September 2, 2016 Category: Biology Authors: Faraji, A., Unlu, I. Tags: Special Collection: Thirty Years of Aedes albopictus (Diptera: Culicidae) in America Source Type: research

Interaction of Wolbachia and Bloodmeal Type in Artificially Infected Aedes albopictus (Diptera: Culicidae)
Maternally inherited Wolbachia bacteria are being introduced into vector mosquito populations, with the goal of reducing the transmission of diseases such as dengue fever. The infection dynamics of Wolbachia depends upon the ability of Wolbachia to manipulate host reproduction as well as any fitness costs imposed upon the host. Some vector mosquito species are opportunistic blood feeders, utilizing both human and nonhuman vertebrate hosts, and the effects of bloodmeal source on Wolbachia phenotype is not well understood. Here we transfer wMelPop Wolbachia from Drosophila melanogaster (Meigen) into wild-type Aedes albopictu...
Source: Journal of Medical Entomology - September 2, 2016 Category: Biology Authors: Suh, E., Fu, Y., Mercer, D. R., Dobson, S. L. Tags: Population Biology/Genetics Source Type: research

Reported Distribution of Aedes (Stegomyia) aegypti and Aedes (Stegomyia) albopictus in the United States, 1995-2016 (Diptera: Culicidae)
Aedes (Stegomyia) aegypti (L.) and Aedes (Stegomyia) albopictus (Skuse) transmit arboviruses that are increasing threats to human health in the Americas, particularly dengue, chikungunya, and Zika viruses. Epidemics of the associated arboviral diseases have been limited to South and Central America, Mexico, and the Caribbean in the Western Hemisphere, with only minor localized outbreaks in the United States. Nevertheless, accurate and up-to-date information for the geographical ranges of Ae. aegypti and Ae. albopictus in the United States is urgently needed to guide surveillance and enhance control capacity for these mosqu...
Source: Journal of Medical Entomology - September 2, 2016 Category: Biology Authors: Hahn, M. B., Eisen, R. J., Eisen, L., Boegler, K. A., Moore, C. G., McAllister, J., Savage, H. M., Mutebi, J.-P. Tags: Sampling, Distribution, Dispersal Source Type: research

Spatial distribution and insecticide susceptibility status of Aedes aegypti and Aedes albopictus in dengue affected urban areas of Rawalpindi, Pakistan.
CONCLUSION: The results suggested that all the field populations of Ae. aegypti and Ae. albopictus existed together and showed qualitative changes in their susceptibility status. Resistance against deltamethrin and lambdacyhalothrin was not confirmed and further investigation was recommended to confirm the change in their susceptibility status. This study could help public health authorities to apply simultaneous control activities on both species due to their coexistence and also resistance management strategies should be formulated to slow down the process of development of resistance. PMID: 27353583 [PubMed - in process]
Source: Journal of Vector Borne Diseases - July 1, 2016 Category: Infectious Diseases Tags: J Vector Borne Dis Source Type: research

Effects of Larval Nutrition on Wolbachia-Based Dengue Virus Interference in Aedes aegypti (Diptera: Culicidae)
In order to assess the broad-scale applicability of field releases of Wolbachia for the biological control of insect-transmitted diseases, we determined the relationship between the larval diet of Aedes aegypti L. mosquitoes infected with Wolbachia strains and their susceptibility to dengue virus (DENV) infection via intrathoracic injection and oral inoculation. Larvae were reared on diets that varied in the quantity of food which had the effect of modifying development time and adult body size. Wolbachia wMel infection was associated with highly significant reductions in dengue serotype 2 (DENV-2) infection rates of betwe...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Kho, E. A., Hugo, L. E., Lu, G., Smith, D. D., Kay, B. H. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Detection and Distribution of V1016Ikdr Mutation in the Voltage-Gated Sodium Channel Gene in Aedes aegypti (Diptera: Culicidae) Populations From Sergipe State, Northeast Brazil
Aedes aegypti (L.) resistance to pyrethroids was recorded in Brazil few years after its introduction as the adulticide in the National Dengue Control Program campaigns. Altered susceptibility to pyrethroids had been reported in the state of Sergipe, northeast Brazil, through biological assays, even before its use against Ae. aegypti in the state. Metabolic and target-site resistance mechanisms were also revealed in samples from Aracaju, the capital of Sergipe. Herein, we investigated the presence and distribution of the kdr mutation V1016Ikdr in Ae. aegypti populations from different municipalities of the state. Aedes aegy...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Dolabella, S. S., Santos, R. L. C., Silva, M. C. N., Steffler, L. M., Ribolla, P. E. M., Cavalcanti, S. C. H., Jain, S., Martins, A. J. Tags: Short Communication Source Type: research

TrapTech R-Octenol Lure Does Not Improve the Capture Rates of Aedes albopictus (Diptera: Culicidae) and Other Container-Inhabiting Species in Biogents Sentinel Traps
This study evaluated the effectiveness of the TrapTech lure (TT lure), containing R-octenol, alone or in combination with the human skin lure in a BGS trap to capture Ae. albopictus and other species. BGS traps with human skin lures or a combination of the two lures collected approximately twice as many Ae. albopictus females compared to those with TT lures. Unlike previous studies, baiting BGS traps with TT lures did not result in increased diversity of mosquito species, or in higher numbers of other container-inhabiting Aedes species. Although human skin lures were clearly superior to TT R-octenol lures in BGS traps, R-o...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Unlu, I., Faraji, A., Indelicato, N., Rochlin, I. Tags: Short Communication Source Type: research

Researchers map mosquitoes that transmit Zika and Dengue by county
(Entomological Society of America) A new article published in the Journal of Medical Entomology features maps of counties in the United States where the mosquitoes known as Aedes aegypti and Aedes albopictus have been recorded.
Source: EurekAlert! - Medicine and Health - June 9, 2016 Category: Global & Universal Source Type: news

Human C5a Protein Participates in the Mosquito Immune Response Against Dengue Virus
Dengue virus (DENV) is transmitted by Aedes spp mosquitoes during a bloodmeal uptake. The bloodmeal consists of host cells, immune factors, and possibly blood-borne pathogens, such as arboviruses. Human cells and immune-related factors, like the complement system, can remain active in the bloodmeal and may be able to interact with pathogens in the mosquito. Previous studies have shown that active complement proteins impact Plasmodium parasite viability in the Anopheles midgut. Thus, we investigated the effects of the human complement on DENV infection in the midgut of Aedes aegypti. Our findings indicate that mosquitoes re...
Source: Journal of Medical Entomology - May 19, 2016 Category: Biology Authors: Londono-Renteria, B., Grippin, C., Cardenas, J. C., Troupin, A., Colpitts, T. M. Tags: Arthropod/Host Interaction, Immunity Source Type: research