Enhanced vector competence of Aedes aegypti (Diptera : Culicidae) from the torres strait compared with mainland Australia for dengue 2 and 4 viruses


Autoria(s): Knox, T. B.; Kay, B. H.; Hall, R. A.; Ryan, P. A.
Data(s)

01/01/2003

Resumo

Australian Aedes aegypti (L.) mosquitoes colonized from the Torres Strait and three mainland localities (Charters Towers, Townsville, and Cairns) were fed on blood suspensions containing dengue virus type 2 (DEN-2) or dengue virus type 4 (DEN-4). Variation was found in oral susceptibility to DEN-2 (59-99% infection) and DEN-4 (28-79% infection) among Ae. aegypti assayed for virus at 8, 12, 16, or 20 d after ingestion of infected blood. Torres Strait Ae. aegypti were the most susceptible to DEN-2 and were significantly more efficient in transmission to capillary tube at 16 d (76% transmission) than mainland Ae. aegypti populations (20-28% transmission). Torres Strait Ae. aegypti were also the most susceptible to DEN-4, although transmission did not vary significantly from mainland populations at 16 d (12% compared with 0-4%) or 20 d (16% compared with 4-16%). Disseminated infection (i.e., leg infection) with either DEN-2 or DEN-4 was not an accurate predictor of transmission potential. This study demonstrates differences among Australian Ae. aegypti populations in vector competence for DEN-2 and DEN-4. Torres Strait Ae. aegypti were more frequently infected and able to transmit DEN-2 at higher rates than mainland populations. These data indicate that the Torres Strait region is potentially more receptive to dengue transmission than mainland localities, a finding discussed with respect to past outbreaks.

Identificador

http://espace.library.uq.edu.au/view/UQ:65106

Idioma(s)

eng

Publicador

Entomological Society of America

Palavras-Chave #Entomology #Veterinary Sciences #Aedes Aegypti #Dengue #Vector Competence #Virus #Transmission #Equine Encephalomyelitis Virus #Monoclonal-antibodies #North Queensland #Oral Infection #Susceptibility #Populations #Type-2 #Dissemination #Mosquitos #Mexico #C1 #270303 Virology #270504 Invertebrate Biology #780105 Biological sciences #730212 Disease distribution and transmission
Tipo

Journal Article