Over 700,000 eggs have been sent to the UK from potentially contaminated Dutch farms, that number up from an early estimate of 21,000, the food watchdog has said.
The Food Standards Agency (FSA) said this represented 0.007% of eggs eaten in the UK each year and that any risk to public health was “very unlikely”.
However, 13 products containing eggs have been withdrawn from supermarkets.
Dutch police have now arrested two people suspected of using the insecticide fipronil.
It follows a joint investigation by Dutch and Belgian police of several premises thought to be using the substance, which can harm humans and is banned in food production.
Supermarkets in Belgium, the Netherlands and Germany have withdrawn millions of eggs from sale.