Bird flu has been found at a second farm in Redgrave, Suffolk.
It comes weeks after a highly pathogenic strain of the virus was discovered at Bridge Farm in Redgrave.
The virus was found on the premises but not in the birds at Gressingham Foods.
Defra say it is not a separate outbreak. Investigators detected presence of the virus at a separate farm while carrying out routine tests.
55,000 ducks will be need to be culled to contain the spread of the virus.
"Defra have today advised of a precautionary cull of ducks on one of our farms near Diss, Norfolk.
"This is a precautionary measure as Defra consider the farm to have potential for dangerous contact with the infected neighbouring farm.
"The welfare of our birds and food safety to our customers are absolute priorities and we work to independently audited, stringent standards in hygiene, bio security and animal welfare. All our farms work to the same high standards."
Public Health England says that the risk to public health from the virus is very low and the Food Standards Agency says that bird flu does not pose a food safety risk for UK consumers.
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