Dozens of Dutch egg companies closed over toxic substance

The Dutch food and consumer product safety authority NVWA halted production at dozens of egg-laying companies while they investigate whether the companies' eggs contain poisonous substance fipronil. This measure was taken as a precaution while inspectors take samples from eggs, laying hens and manure, ANP reports.

On Saturday the NVWA already halted production at seven other poultry companies. Some of the companies were ordered to recall their eggs.

"In the investigation the NVWA has not found concentrations in egs that pose a direct danger to public health", the NVWA said. The authority added that while there is no immediate danger, prolonged consumption of eggs containing fipronil can be harmful to health.

Fipronil is often used as a pesticide and in flea colors for cats and dogs.