The H5NI avian flu virus has spread to Africa and the European Union for the first time. Attention is focused on controlling the outbreaks, especially in Nigeria, where, as Nature went to press, four farms in two adjacent provinces were confirmed as being affected, with further spread suspected. But experts are also urgently trying to confirm the cause of the virus's geographical spread. Although migratory birds have been widely blamed, some believe that the risks posed by the poultry trade are being overlooked.
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