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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Vector competence of Aedes aegypti mosquitoes for filarial nematodes is affected by age and nutrient limitation
Author(s): Ariani, Cristina
Juneja, Punita
Smith, Sophia
Tinsley, M C
Jiggins, Francis M
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Keywords: Ageing
Brugia malayi
Refeeding syndrome
Issue Date: Jan-2015
Date Deposited: 3-Dec-2014
Citation: Ariani C, Juneja P, Smith S, Tinsley MC & Jiggins FM (2015) Vector competence of Aedes aegypti mosquitoes for filarial nematodes is affected by age and nutrient limitation. Experimental Gerontology, 61, pp. 47-53.
Abstract: Mosquitoes are one of the most important vectors of human disease. The ability of mosquitoes to transmit disease is dependent on the age structure of the population, as mosquitoes must survive long enough for the parasites to complete their development and infect another human. Age could have additional effects due to mortality rates and vector competence changing as mosquitoes senesce, but these are comparatively poorly understood. We have investigated these factors using the mosquito Aedes aegypti and the filarial nematode Brugia malayi. Rather than observing any effects of immune senescence, we found that older mosquitoes were more resistant, but this only occurred if they had previously been maintained on a nutrient-poor diet of fructose. Constant blood feeding reversed this decline in vector competence, meaning that the number of parasites remained relatively unchanged as mosquitoes aged. Old females that had been maintained on fructose also experienced a sharp spike in mortality after an infected blood meal ("refeeding syndrome") and few survived long enough for the parasite to develop. Again, this effect was prevented by frequent blood meals. Our results indicate that old mosquitoes may be inefficient vectors due to low vector competence and high mortality, but that frequent blood meals can prevent these effects of age.
DOI Link: 10.1016/j.exger.2014.11.001
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