Kona Blue of Hawaii and American Gold Seafoods of Seattle received a clean bill of health Thursday after officials of the U.S. Food and Drug Administration concluded their products posed no threat to human health, The Washington Post (NYSE:WPO) reports.

The two companies were among 198 hatcheries that used potentially contaminated feed from a Canadian company that used components from two Chinese suppliers, the newspaper said.

The Chinese firms had added melamine to their products to boost protein levels, causing kidney failure in an unknown number of dogs and cats.

Beginning in late April, the FDA impounded all "vegetable protein concentrate" from China and stepped up surveillance of adulterated protein additives from overseas, the Post report stated.