I'm glad you called Purina too! I spoke at length with them about this problem, and they do seem concerned. I went through the bag of large breed kibble (that I have not found any worms in) scoop by scoop. But I did have infestation in the chicken chunks exactly as you stated & found worms in the puppy kibble. I put the current bag of dog food outside for 3 days during our below zero weather. I wanted to change food, but have read similar stories online about other food! Going to keep a CLOSE eye on the dog food. I told Purina to GOOGLE worms in food, because it is all over the internet.........very upset this has happened. I am also purchasing from a smaller pet food store that does not have a huge warehouse of food stored. My wormy bag came from California