July 22, 2014
New dengue paper published in Parasites and Vectors
A new paper by Brady et al, Global temperature constraints on Aedes aegypti and Ae. albopictus persistence and competence for dengue virus transmission has been published in Parasites and Vectors.
Dengue is a disease that has undergone significant expansion over the past hundred years. Understanding what factors limit the distribution of transmission can be used to predict current and future limits to further dengue expansion. While not the only factor, temperature plays an important role in defining these limits. Previous attempts to analyse the effect of temperature on the geographic distribution of dengue have not considered its dynamic intra-annual and diurnal change and its cumulative effects on mosquito and virus populations.
The papers's finding that Ae. albopictus has a greater capacity for dengue transmission than Ae. aegypti is contrary to current explanations for the comparative rarity of dengue transmission in established Ae. albopictus populations. This suggests that the limited capacity of Ae. albopictus to transmit DENV is more dependent on its ecology than vector competence. The recommendations, explicitly outlined here, point to clear targets for entomological investigation.