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Notifiable diseases
Investigations reveal rare mutation event in avian influenza outbreak

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INVESTIGATIONS into an outbreak of highly pathogenic H7N7 avian influenza on a premises in Lancashire, which was reported on July 13, have suggested that contact with wild birds was the most likely source of virus. However, according to a report from Defra, a rare mutation event within the poultry premises resulted in a low pathogenic virus becoming highly pathogenic.

This conclusion was reported by Defra's International Disease Monitoring (IDM) team in a preliminary outbreak assessment of a case of highly pathogenic avian influenza (HPAI) reported in Germany on July 24. The virus responsible for …

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