At least 17 countries have been hit with the European egg scandal involving insecticide contamination. Ground zero of the problem has not been definitively identified, as Belgium, the Netherlands and Germany are reportedly pointing fingers over which country is to blame and how long they knew about the problem. Dutch authorities may have known about the problem as far back as November 2016.

The eggs have been tainted with the pesticide Fipronil, doses of which are not harmful to humans engaging in short-term consumption. When consumed in large doses, it can cause damage to the kidneys, liver and thyroid glands.

Farmers in the Netherlands used a company, Chickfriend, to delouse their chickens, but this company reportedly mixed fipronil into the cleaning solution and could have contaminated nearly 180 farms in the country as a result, according to The New York Times. As many as 20% of Dutch egg-laying chickens could be affected. Chickfriend was recently raided by authorities and two of its directors were arrested. Antwerp-based Poultry-Vision stated that it provided Chickfriend with fipronil via a source in Romania, according to The Guardian.

Contaminated eggs, which have been distributed to at least 17 countries (mainly in Europe) have also been found at producers in Belgium, France and Germany, and as a result, millions of eggs have either been destroyed or removed from store shelves.