Its plant in Nevada processes about 1.5 million pounds of raw milk daily into 250,000 pounds of whole milk powder. Organic West subsequently sold the milk powder to ByHeart. ByHeart officials declined to identify the source of those milk powder samples. Botulism spores are common in the environment and can be found in most foods at very low levels, said Kristin Schill, a botulism expert at the University of Wisconsin-Madison. Botulism spores have been found in infant formula in the past, but this is the first large outbreak linked to the product.