First Report of Aedes aegypti Transmission of Chikungunya Virus in the Americas

During a chikungunya fever outbreak in late 2014 in Chiapas, Mexico, entomovirological surveillance was performed to incriminate the vector(s). In neighborhoods, 75 households with suspected cases were sampled for mosquitoes, of which 80% (60) harbored Aedes aegypti and 2.7% (2) Aedes albopictus. A...

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Bibliographic Details
Published in:The American journal of tropical medicine and hygiene 2015-12, Vol.93 (6), p.1325-1329
Main Authors: Díaz-González, Esteban E, Kautz, Tiffany F, Dorantes-Delgado, Alicia, Malo-García, Iliana R, Laguna-Aguilar, Maricela, Langsjoen, Rose M, Chen, Rubing, Auguste, Dawn I, Sánchez-Casas, Rosa M, Danis-Lozano, Rogelio, Weaver, Scott C, Fernández-Salas, Ildefonso
Format: Article
Language:English
Subjects:
Aedes - virology
Aedes aegypti
Aedes albopictus
Animals
Chikungunya Fever - epidemiology
Chikungunya Fever - transmission
Chikungunya virus
Chikungunya virus - genetics
Chikungunya virus - physiology
Female
Housing - statistics & numerical data
Humans
Insect Vectors - virology
Male
Mexico - epidemiology
Phylogeny
Reverse Transcriptase Polymerase Chain Reaction
RNA, Viral - genetics
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Description
Summary:During a chikungunya fever outbreak in late 2014 in Chiapas, Mexico, entomovirological surveillance was performed to incriminate the vector(s). In neighborhoods, 75 households with suspected cases were sampled for mosquitoes, of which 80% (60) harbored Aedes aegypti and 2.7% (2) Aedes albopictus. A total of 1,170 Ae. aegypti and three Ae. albopictus was collected and 81 pools were generated. Although none of the Ae. albopictus pools were chikungunya virus (CHIKV)-positive, 18 Ae. aegypti pools (22.8%) contained CHIKV, yielding an infection rate of 32.3/1,000 mosquitoes. A lack of herd immunity in conjunction with high mosquito populations, poor vector control services in this region, and targeted collections in locations of human cases may explain the high infection rate in this vector. Consistent with predictions from experimental studies, Ae. aegypti appears to be the principal vector of CHIKV in southern Mexico, while the role of Ae. albopictus remains unknown.
ISSN:0002-9637
1476-1645
DOI:10.4269/ajtmh.15-0450