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Volume 14, Number 11—November 2008

Dispatch

Domestic Pigs and Japanese Encephalitis Virus Infection, Australia

Andrew F. van den HurkComments to Author , Scott A. Ritchie, Cheryl A. Johansen, John S. MacKenzie, and Greg A. Smith
Author affiliations: Queensland Health, Coopers Plains, Queensland, Australia (A.F. van den Hurk, G.A. Smith); The University of Queensland, St. Lucia, Queensland, Australia (A.F. van den Hurk); Queensland Health, Cairns, Queensland, Australia (S.A. Ritchie); James Cook University, Cairns (S.A. Ritchie); The University of Western Australia, Nedlands, Western Australia, Australia (C.A. Johansen)Australian Biosecurity Cooperative Research Centre for Emerging infectious Diseases, Perth, Western Australia, Australia (J.S. Mackenzie);

Main Article

Table

Mosquito infection rates during 3 recognized incursions of Japanese encephalitis virus, Badu Island, northern Australia*

Collection location Pigs located within community
Pigs relocated outside community
1995
1998
2003
No.† No. detected‡ Infection rate (95% CI) No.† No. detected‡ Infection rate (95% CI) No.† No. detected‡ Infection rate (95% CI)
Community 2,871 8 3.02 
(1.43–5.74) 23,467 38 1.69 
(1.21–2.29) 7,019 5 0.75 
(0.28–1.66)
Piggery NS NS NS NS NS NS 3,316 5 1.61 
(0.61–3.56)
Dump NS NS NS 1,125 4 3.68 
(1.20–8.85) 6,530 6 0.99 
(0.41–2.07)

*Mosquito infection rates determined by maximum-likelihood estimation; 1995, Apr 8–9 and 20–21, 30 trap nights; 1998, Mar 5–6, 25 trap nights; 2003, Mar 13–19, 92 trap nights; CI, confidence interval; NS, mosquitoes not sampled from this location during the year of collection.
†Total no. mosquitoes processed.
‡No. Japanese encephalitis virus–positive pools detected by virus isolation or TaqMan reverse transcription–PCR.

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