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Am. J. Trop. Med. Hyg., 56(1), 1997, pp. 80-84
Copyright © 1997 by The American Society of Tropical Medicine and Hygiene

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Isolation of Japanese Encephalitis Virus from Culex annulirostris in Australia

Scott A. Ritchie, Debbie Phillips, Annette Broom, John Mackenzie, Michael Poidinger AND Andrew Van Den Hurk
Tropical Public Health Unit, Cairns, Queensland, Australia; World Health Organization Collaborating Centre for Arbovirus Reference and Research, Queensland Health's Laboratory of Microbiology and Pathology, Brisbane, Queensland, Australia; Department of Microbiology, The University of Western Australia, Nedlands, Western Australia; Department of Microbiology, The University of Queensland, Brisbane, Queensland, Australia

Mosquitoes were collected using CO2 and octenol-baited light traps during an outbreak of Japanese encephalitis (JE) on Badu Island in the Torres Strait, Australia in April 1995. A total of 13,300 mosquitoes comprising 12 species were processed for virus isolation. Eight isolates of JE virus were obtained from Culex annulirostris, with a carriage rate of 2.97:1,000; this mosquito also yielded one Sindbis virus isolate. A reverse transcriptase-polymerase chain reaction was used to sequence the JE viruses, which were compared with published sequences. The eight isolates were 90% homologous with known JE strains but only 68% homologous with other flaviviruses. Among the isolates, 99% homology was obtained, suggesting a common point of origin.




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M. REID, D. MACKENZIE, A. BARON, N. LEHMANN, K. LOWRY, J. AASKOV, F. GUIRAKHOO, and T. P. MONATH
Experimental infection of culex annulirostris, culex gelidus, and aedes vigilax with a yellow fever/japanese encephalitis virus vaccine chimera (chimerivaxtm-je).
Am J Trop Med Hyg, October 1, 2006; 75(4): 659 - 663.
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Copyright © 1997 by the American Society of Tropical Medicine and Hygiene.