2.3.2. Probability bird infected (Pb)
In Bali, collectors source poultry from three types of poultry producer (source i), semi-intensive poultry farms,
backyard flocks, or collector yards. These producers are found in villages throughout Bali. It is unknown what proportions of collectors supply LBMs with poultry from different sources, so the selection of poultry from various source locations is randomly determined in the model. To accountfor the different prevalence levels of H5N1 atthese sources,the probability a bird from source i is infected (Pbi) will vary. We assume that all birds are equally at risk of H5N1 infection.