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Adverse ffects of covert iridovirus infection on life history and demographic parameters of Aedes aegypti

Adverse ffects of covert iridovirus infection on life history and demographic parameters of Aedes aegypti,10.1046/j.1570-7458.2003.00010.x,Entomologia

Adverse ffects of covert iridovirus infection on life history and demographic parameters of Aedes aegypti   (Citations: 15)
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Sublethal viral infections can cause changes in the body size and demography of insect vectors, with important consequences for population dynamics and the probability that individual mosquitoes will transmit disease. This study examined the effects of covert (sublethal) infection by Invertebrate iridescent virus 6 (IIV-6) on the demography of female Aedes aegypti and the relationship between key life history parameters in covertly infected female insects compared with healthy (control) insects or non-infected mosquitoes that had survived exposure to virus inoculum without becoming infected. Of the female mosquitoes that emerged following exposure to virus inoculum and were offered blood meals, 29% (43/150) proved positive for covert IIV-6 infection. The net reproductive rate (R 0 ) of covertly infected females was 50% lower for infected females compared to control mosquitoes, whereas non-infected exposed females had an R 0 approximately 15% lower than that of controls. Reproduction caused a significant decrease of about 13 days in mosquito longevity compared to females that did not reproduce (P < 0.001). Infected females lived 5 - 8 days less than non-infected exposed females or controls, respectively (P = 0.028). Infected females and non-infected exposed females both had significantly shorter wings than control insects (P < 0.001). There was a significant positive correlation between wing length and longevity in covertly infected female mosquitoes but not in control or non-infected exposed mosquitoes. Longer lived females produced more eggs in all treatments. There were no significant correlations between body size and fecundity or the production of offspring. There was also no correlation between fecundity and fertility, suggesting that sperm inactivation was a more likely cause of decreased fertility in older mosquitoes than sperm depletion. We conclude that covert infection by iridescent virus is likely to reduce the vectorial capacity of this mosquito.
Journal: Entomologia Experimentalis Et Applicata - ENTOMOL EXP APPL , vol. 106, no. 1, pp. 53-61, 2003
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    • ...longevity and body size, at least in the case of the mosquito Aedes aegypti (45)...

    Trevor Williamset al. Invertebrate Iridovirus modulation of apoptosis

    • ...IIV-6 is the type species of the genus Iridovirus, that represents the standard model for the study of this group of viruses [5], and which can cause lethal and sublethal disease inAedesaegypti, the principal vector of dengue and yellow fever [10]...

    A. Hernándezet al. Persistence of invertebrate iridescent virus 6 in tropical artificial ...

    • ...To purify the IIV-6, infected larvae were triturated in 1 ml sterile distilled water and subjected to three steps of centrifugation at 490 g for 10 min, 15 300 g for 10 min, followed by a 30% (wt/vol) sucrose cushion at 15 300 g for 30 min and two washes in sterile water as described by Marina et al. (2003)...
    • ...Previous studies had shown this to be an effective means of eliminating residual virus inoculum and other compounds (Marina et al., 1999, 2003)...
    • ...Recently, we reported an increase of approximately 0.5 ‐1.0 days in the development times of Ae. aegypti larvae exposed to IIV-6 or virus inactivated by heat or ultraviolet (UV) light (Marina et al., 2003)...

    Carlos F. Marinaet al. Effects of an optical brightener and an abrasive on iridescent virus i...

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