Feed Additives to Fight Salmonella and Campylobacter

Dr. Applegate, For Salmonella sp concern we can check some research that look for Salmonella in gut, and others to the Salmonella in feathers and the environment. Salmonella is part of the natural microbiome, in your mind, for food safety, we must look for control the environmental Salmonella, or try fight the Salmonella in the gut?

I was waiting to hear about some potential feed additives to combat Salmonella, but unfortunately I did not hear about that.