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IT is possible that bluetongue may have been circulating in wildlife in France in recent years and has re-emerged in domestic ruminants this year when herd immunity dropped below a threshold and there were high numbers of the vector midge.
This is an idea discussed by Defra's International Disease Monitoring (IDM) team in a recent update on the bluetongue situation in France. In an update on October 23, the team said that there was still some uncertainly around the source of the disease, which has been affecting areas of central France since September. However, noting that better …