Delrieu M., O'Connor O., Pocquet N., Teraiharoa K., Griffon A. F., Menkès Christophe, Mangeas Morgan, Viennet E., Burtet-Sarramegna V., Dupont-Rouzeyrol M., Frentiu F. D. (2026). The effect of increased temperature on dengue virus in the vector Aedes aegypti from New Caledonia. Tropical Medicine and Infectious Disease, 11 (2), p. 53 [9 p.]. ISSN 2414-6366.
Titre du document
The effect of increased temperature on dengue virus in the vector Aedes aegypti from New Caledonia
Année de publication
2026
Auteurs
Delrieu M., O'Connor O., Pocquet N., Teraiharoa K., Griffon A. F., Menkès Christophe, Mangeas Morgan, Viennet E., Burtet-Sarramegna V., Dupont-Rouzeyrol M., Frentiu F. D.
Source
Tropical Medicine and Infectious Disease, 2026,
11 (2), p. 53 [9 p.] ISSN 2414-6366
Dengue virus (DENV) is a major public health concern in tropical and subtropical regions, including the Pacific. Temperature is recognised as a major driver of transmission under climate change. Understanding how higher temperatures may alter DENV transmission is essential to anticipate future dengue risk. Therefore, we assessed the effect of temperature on DENV-1 in Aedes aegypti from New Caledonia. Mosquitoes were orally infected and maintained for 14 days at 26.6 degrees C (average temperatures during recent outbreaks) or 31.1 degrees C (SSP5-8.5 scenario projected temperatures). Mosquito bodies, heads, and saliva were analysed separately to determine infection, dissemination, and transmission rates as well as transmission efficiencies. Infectious virus was detected by using a fluorescent focus assay, and viral titres were quantified via TCID50 assays. No significant differences were observed in infection, dissemination, and transmission rates or transmission efficiencies between the two temperatures. However, DENV titres in mosquito bodies and heads were significantly higher at 31.1 degrees C than 26.6 degrees C. Our results indicate that elevated temperature increases viral loads within the insect but not the proportion of infectious mosquitoes, highlighting the importance of considering temperature as a key parameter in assessing dengue risk under climate change. Further studies are needed to investigate the effects of temperature on virus-mosquito interactions.
Plan de classement
Sciences du milieu [021]
;
Entomologie médicale / Parasitologie / Virologie [052]
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD [F B010096421]
Identifiant IRD
fdi:010096421
