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Listeria - The Poison Squad
Meat was preserved with formaldehyde and adulterated with plaster of Paris to get rid of the murky blue tint because it had been diluted with pond water. In 1870, the North Atlantic meat trade agreement was passed, which allowed for excess cattle in North America to be shipped to Europe whose cattle population had dwindled due to things like contagious bovine pleuronemonia and foot and mouth disease. It's easy to see how these practices with essentially no oversight for food safety, mass processing of milk based products and meats would have led to a massive increase in listeria.