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For example, the following Figure shows the layout of households in a Thai village, overlaid with the occurrence of cases of foot-and-mouth disease. From this map, it is apparent that this is a propagating epidemic, with the index case identified by a red circle, a small number of secondary cases identified in week 2 and additional cases in week 3. It also appears that infection has spread locally from the index case to a number of nearby households, as well as to some more remote households, where there has also been local spread. The initial spread was perhaps through utilisation of common grazing, allowing close contact between early cases and susceptible animals from elsewhere in the village. This was probably followed by local spread among clusters of households and perhaps from infected animals moving on laneways through the village.