Basically, owing to millions of eggs being removed from supermarket and shop shelves as a result of the ‘Fipronil scandal’ in August this year.
At the time, tests conducted on chicken droppings, blood and eggs showed high levels of the insecticide fipronil, a common ingredient in veterinary products for getting rid of fleas, lice and ticks, but banned from being used to treat animals destined for human consumption.
Fipronil is an insecticide that can be used in warehouses etc. but is banned in poultry houses. According to an article in the Guardian (3 August 2017),
Belgian prosecutors were reported to be examining the client list of two companies in Flanders specialising in the production and supply of anti-lice agents to Dutch and Belgian farms, among others. It is feared the illegal substance was mixed with an insecticide used legally in the keeping of chickens to improve its effectiveness.
Millions of eggs were recalled from shops and warehouses in Germany and the Netherlands and were also blocked from sale in Belgium after some were found to contain high levels of Fipronil … It is reported that 2.9m eggs from companies believed to have used the fipronil anti-lice agent were delivered to Germany before 22 July, when exports were blocked, although many of them remained in packing stations.