Time-space clustering of reported blowfly strike in Queensland sheep flocks |
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Authors: | Ward M P Armstrong R T |
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Institution: | Animal Research Institute, Queensland Department of Primary Industries, Moorooka, Australia. wardmp@dpi.qld.gov.au |
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Abstract: | The reported occurrence of blowfly strike in 57 sheep flocks in Queensland, Australia, was investigated for time-space clustering in an exploratory study using Knox's method. Flystrike occurrence peaked in late spring and early summer, with an additional late-autumn peak in southern-Queensland flocks. A total of 1596 case-pairs was examined. Significant clustering (P = 0.07) was only detected for case-pairs occurring within 3 months and 150 km of each other; 164 case-pairs were declared close compared to an expectation of 151. We suggest that factors common to a district (such as rainfall and temperature) are responsible for clustering of flystrike in Queensland. |
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