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Volume 13, Number 11—November 2007


Mycobacterium ulcerans in Mosquitoes Captured during Outbreak of Buruli Ulcer, Southeastern Australia

Paul D.R. Johnson*†‡§Comments to Author , Joseph Azuolas¶, Caroline J. Lavender‡, Elwyn Wishart¶, Timothy P. Stinear§, John A. Hayman‡§, Lynne Brown#, Grant A. Jenkin§, and Janet A.M. Fyfe‡
Author affiliations: *Austin Health, Melbourne, Victoria, Australia; †University of Melbourne, Melbourne, Victoria, Australia; ‡Victorian Infectious Diseases Reference Laboratory, North Melbourne, Victoria, Australia; §Monash University, Melbourne, Victoria, Australia; ¶Department of Primary Industries, Melbourne, Victoria, Australia; #Department of Human Services, Melbourne, Victoria, Australia;

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Table 2

Relationship between cases of Buruli ulcer, mosquitoes tested, and maximum likelihood estimate (MLE) per 1,000 mosquitoes trapped in Victoria, Australia, and tested by PCR for insertion sequence IS2404 of Mycobacterium ulcerans*

Region No. cases past 5 y No. mosquitoes tested (% Aedes camptorhynchus)† No. pools positive MLE (95% CI)
Point Lonsdale 79 11,504 (91.8) 48 4.2 (3.08–5.53)
Bellarine Peninsula (excluding Point Lonsdale) 30 2,119 (88.7) 3 1.42 (0.37–3.85)
Bass coast Shire including Phillip Island 2 795 (82.1) 1 1.25 (0.07–6.03)
Central and northern Victoria (Mildura, Swan Hill, Moira, Shepparton)
471 (48.0)
0 (0–7.34)
Total 111 14,889 (89.4) 52 3.57 (2.70–4.64)

*MLE bias was corrected when >1 pool was positive, otherwise uncorrected. CI, confidence interval
†p value = 0.07 (χ2: 4 × 2 table; pools positive/no. tested).

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