Dengue-1 virus and vector competence of Aedes aegypti (Diptera: Culicidae) populations from New Caledonia

被引:20
作者
Calvez, Elodie [1 ]
Guillaumot, Laurent [2 ]
Girault, Dominique [1 ]
Richard, Vaea [3 ]
O'Connor, Olivia [1 ]
Paoaafaite, Tuterarii [3 ]
Teurlai, Magali [4 ]
Pocquet, Nicolas [2 ]
Cao-Lormeau, Van-Mai [3 ]
Dupont-Rouzeyrol, Myrielle [1 ]
机构
[1] Inst Pasteur Nouvelle Caledonie, URE Dengue & Autres Arboviroses, Reseau Int Inst Pasteur, Noumea, New Caledonia
[2] Inst Pasteur Nouvelle Caledonie, URE Entomol Med, Reseau Int Inst Pasteur, Noumea, New Caledonia
[3] Inst Louis Malarde, Papeete, French Polynesi, France
[4] Inst Pasteur Nouvelle Caledonie, URE Epidemiol Malad Infect, Reseau Int Inst Pasteur, Noumea, New Caledonia
来源
PARASITES & VECTORS | 2017年 / 10卷
关键词
Dengue virus (DENV); Aedes aegypti; New Caledonia; Pacific region; Vector competence; QUANTITATIVE TRAIT LOCI; ORAL-SUSCEPTIBILITY; INFECTION; PACIFIC; PATHWAY; DIFFERENTIATION; TRANSMISSION; ALBOPICTUS; ISLANDS; RNAI;
D O I
10.1186/s13071-017-2319-x
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
Background: Dengue virus (DENV) is the arbovirus with the highest incidence in New Caledonia and in the South Pacific region. In 2012-2014, a major DENV-1 outbreak occurred in New Caledonia. The only known vector of DENV in New Caledonia is Aedes aegypti but no study has yet evaluated the competence of New Caledonia Ae. aegypti populations to transmit DENV. This study compared the ability of field-collected Ae. aegypti from different locations in New Caledonia to transmit the DENV-1 responsible for the 2012-2014 outbreak. This study also aimed to compare the New Caledonia results with the vector competence of Ae. aegypti from French Polynesia as these two French countries have close links, including arbovirus circulation. Methods: Three wild Ae. aegypti populations were collected in New Caledonia and one in French Polynesia. Female mosquitoes were orally exposed to DENV-1 (106 FFU/ml). Mosquito bodies (thorax and abdomen), heads and saliva were analyzed to measure infection, dissemination, transmission rates and transmission efficiency, at 7, 14 and 21 days post-infection (dpi), respectively. Results: DENV-1 infection rates were heterogeneous, but dissemination rates were high and homogenous among the three Ae. aegypti populations from New Caledonia. Despite this high DENV-1 dissemination rate, the transmission rate, and therefore the transmission efficiency, observed were low. Aedes aegypti population from New Caledonia was less susceptible to infection and had lower ability to transmit DENV-1 than Ae. aegypti populations from French Polynesia. Conclusion: This study suggests that even if susceptible to infection, the New Caledonian Ae. aegypti populations were moderately competent vectors for DENV-1 strain from the 2012-2014 outbreak. These results strongly suggest that other factors might have contributed to the spread of this DENV-1 strain in New Caledonia and in the Pacific region.
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页数:8
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