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Hall-Mendelin S, Pyke AT, Ramirez AL, Staunton KM, Burtonclay P, McMahon J, Barcelon J, van den Hurk AF. Infection, Dissemination, and Replication of Urban and Sylvatic Strains of Dengue Virus Type 2 (Flaviviridae: Flavivirus) in Australian Aedes aegypti (Diptera: Culicidae). J Med Entomol 2021; 58:1412-1418. [PMID: 33459781 DOI: 10.1093/jme/tjaa292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Indexed: 06/12/2023]
Abstract
The dengue viruses (DENVs) occur throughout tropical and subtropical regions of the world where they infect 100s of millions of people annually. In Australia, the dengue receptive zone is confined to the northern state of Queensland where the principal vector Aedes aegypti (L.) is present. In the current study, two populations of Ae. aegypti from north Queensland were exposed to two urban outbreak strains and one sylvatic strain of dengue virus type 2 (DENV-2). The titer of virus required to infect 50% of mosquitoes was between 105 and 106 50% tissue culture infectious dose (TCID)50/ml and was influenced by the combination of the origin of Ae. aegypti population and virus strain. When exposed to infectious bloodmeal titers > 106 TCID50/ml, infection and dissemination rates were all > 50% and were significantly affected by the origin of the mosquito population but not by the strain of DENV-2. Replication of DENV-2 was also significantly affected by the mosquito population and the titer of the infectious bloodmeal that mosquitoes were exposed to. The results of this study are discussed in the context of DENV transmission dynamics in northern Australia and the relative fitness of the sylvatic virus strain in urban Ae. aegypti populations.
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Affiliation(s)
- Sonja Hall-Mendelin
- Public Health Virology, Forensic and Scientific Services, Department of Health, Brisbane, Queensland, Australia
| | - Alyssa T Pyke
- Public Health Virology, Forensic and Scientific Services, Department of Health, Brisbane, Queensland, Australia
| | - Ana L Ramirez
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Cairns, Queensland, Australia
- Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
- Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA
| | - Kyran M Staunton
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Cairns, Queensland, Australia
- Australian Institute of Tropical Health and Medicine, James Cook University, Cairns, Queensland, Australia
| | - Peter Burtonclay
- Public Health Virology, Forensic and Scientific Services, Department of Health, Brisbane, Queensland, Australia
| | - Jamie McMahon
- Public Health Virology, Forensic and Scientific Services, Department of Health, Brisbane, Queensland, Australia
| | - Jean Barcelon
- Public Health Virology, Forensic and Scientific Services, Department of Health, Brisbane, Queensland, Australia
| | - Andrew F van den Hurk
- Public Health Virology, Forensic and Scientific Services, Department of Health, Brisbane, Queensland, Australia
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