British food safety authorities believe around 700,000 contaminated eggs have been imported into the country, and the Food Standards Agency has issued a list of products in which the eggs could be found.
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It is moderately toxic and can cause organ damage in humans, but a large number of contaminated eggs would need to be eaten for any negative health effects to be observed.
Dozens of farms are being checked in the Netherlands, while Belgium's food safety agency is probing how Fipronil might have entered eggs destined for supermarkets.
The Veterinary Health Authority said in a statement that authorities discovered 1,000 kilograms (2,200 pounds) of eggs before they had reached supermarket shelves.
According to the KFDA, the only European eggs that were imported over the past year were 57 tons from Spain.
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It added that in the United Kingdom, the Dutch eggs were not sold as shell eggs but used in foods with many other ingredients - mostly sandwich fillings or other chilled foods. "However, Fipronil is not legally allowed for use near food-producing animals and it shouldn't be there".
It said: "Some of the products made from these eggs will have had a short shelf life and will have already been consumed, however, we identified some that were still within the expiry date".
Farms had been shut down in four countries-Belgium, Netherlands, Germany and France-where authorities have confirmed the illegal use of the substance to treat poultry farms, Rosario said.
Earlier this month, Dutch and Belgian prosecutors launched a joint investigation at eight locations across The Netherlands with the assistance of Europe's policing and judicial agencies Europol and Eurojust.
In total, 15 countries of the Union are, therefore, affected by the scandal. The BBC adds that "a criminal investigation is under way in Belgium and the Netherlands, centring on two firms - Poultry Vision, a pest control firm from Belgium, which is alleged to have sold the treatment to a Dutch poultry farm cleaning company, Chickfriend".
It has since emerged that Belgian officials knew about the contamination in June, but did not make the information public.
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