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For the Menangle virus outbreak, the piggery comprised four separate management Units. Unit 1 was about 200m from Unit 2, while units 2 and 3 and 3 and 4 were each separated by about 50m (see Figure 1 in Kirkland, et al,. 2001). Although all units were affected, 44% of litters were affected in Unit 2, compared to 28%, 26% and 37% for Units 1, 3 and 4 respectively. Analysis also showed that Unit 3 was affected first, in week 15. Other units were subsequently affected in weeks 23 (Unit 2), 24 (Unit 4) and 27 (Unit 1). It was also observed that a fruit bat colony (the hypothesised source of infection) was in close proximity to Units 3 and 4. Unit 1 was furthest from the hypothesised source and was the last unit to be affected, while Units 3 and 4 were closest to the hypothesised source.