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A dengue suppression strategy based on release of mosquitoes infected with the bacterium is being trialed in many countries. inhibits replication and transmission of dengue viruses. Questions remain regarding the long-term stability of virus-suppressive effects. We sequenced the genome and analyzed mitochondrial DNA markers isolated from mosquitoes sampled 2-8 years after releases in the greater Cairns region, Australia. Few changes were detected when genomes of field mosquitoes were compared with genomes of mosquitoes obtained soon after initial releases. Mitochondrial variants associated with the initial release stock are now the only variants found in release sites, highlighting maternal leakage as a possible explanation for rare -negative mosquitoes and not migration from non-release areas. There is no evidence of changes in the genome that indicate selection against its viral-suppressive effects or other phenotypes attributable to infection with the bacterium.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7527712 | PMC |
http://dx.doi.org/10.1016/j.isci.2020.101572 | DOI Listing |
Lancet Planet Health
September 2025
Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa.
Rift Valley fever (RVF), a zoonotic mosquito-borne viral disease with erratic occurrence and complex epidemiology, results in substantial costs to veterinary and public health and national economies. Since 1985, RVF virus (RVFV) epidemiology has focused on epidemics triggered by flood-induced emergence of transovarially infected mosquitoes, following an interepidemic period during which RVFV persists primarily in floodwater Aedes spp mosquito eggs, with potential for low-level interepidemic circulation. In this Personal View, we challenge this classic framework of RVFV epidemiology, presenting instead a spectrum of RVFV dynamics ranging from epidemic to hyperendemic.
View Article and Find Full Text PDFParasite
September 2025
Parasitology Department, São Paulo University, 1374 Av. Prof. Lineu Prestes, São Paulo, State of São Paulo 05508-000, Brazil.
Understanding why Diptera, such as mosquitoes and sand flies, feed on humans is crucial in defining them as vectors of diseases such as malaria, dengue fever, Zika virus, and leishmaniasis. Determining their attraction to humans (anthropophily) helps in assessing the risk of disease transmission, designing effective vector control strategies, and monitoring the effectiveness of existing control measures. An important question is whether they are specifically attracted to humans in preference to other mammals or whether there is something else at play.
View Article and Find Full Text PDFPLoS One
September 2025
Togliatti State University, Togliatti, Russia.
Forest fires have a significant impact on forest fauna, killing not only mammals and birds, but also less noticeable representatives of forest fauna - insects. Existing research have mainly studied the effects on vertebrate taxa, but the data on the effects of fires on the number of insects living in forests is currently insufficient to cover all the groups. The research presented in this paper examines the immediate impact of forest fires on the number of adults in mosquito populations (Culicidae) in burned areas of the boreal forest.
View Article and Find Full Text PDFPLoS One
September 2025
Instituto de Física, Universidade Federal da Bahia (UFBA), Salvador, Bahia, Brazil.
Dengue fever remains a major public health concern, requiring continuous efforts to mitigate its impact. This study investigates the influence of key temperature-dependent parameters on dengue transmission dynamics in Foz do Iguaçu, a tri-border municipality in southern Brazil, using a mathematical model based on a system of ordinary differential equations. The fitted model aligns well with observed data.
View Article and Find Full Text PDFIntegr Environ Assess Manag
September 2025
Water Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa.
Pesticides are widely used to meet the food demands of a growing population, with various types used to control pests depending on the crops grown. Rainfall, overspray, and runoff from agricultural fields can wash these insecticides into water bodies, posing documented environmental risks. Imidacloprid is commonly used in Afrotropical regions such as South Africa, yet limited information is available on its toxicity to aquatic ecosystems within this climate region.
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