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Most likely way of ASF introduction into Japan (A); most likely source of ASF introduction into Japan (B); production system mostly affected (C); and risk factors associated with the persistence of ASF in Japan (D). The scale on the vertical axis indicates the risk: 0 (negligible risk); 1 (very low risk); 2 (low risk); 3 (moderate risk); 4 (high risk) and 5 (very high risk). Open circles indicate the average and error bars indicate the range of expert opinions.
