About 63 per cent of North Island commercial poultry farms and 79 per cent of South Island farms have been tested for a poultry virus found at Mainland Poultry in Otago - and no other sites have tested positive.
Biosecurity New Zealand was working with the poultry industry on a delimiting survey to test every commercial poultry farm in the country.
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In September, it announced it was managing a possible case of Infectious Bursal Disease Virus type 1 (IBDV-1) at the Mainland Poultry egg farm in Waikouaiti.
The virus - not found in New Zealand for 20 years - posed no risk to human health or the health of other animals.