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Salmonella dublin, a type of bacteria that primarily infects cattle but some strains also can adapt to infect humans, is increasingly becoming resistant to antibiotics, making it a growing public health threat, according to the U.S. Centers for Disease Control and Prevention. Researchers at Penn State investigated how strains of the pathogen — which can cause severe illness and death in cattle and blood infections and hospitalization in humans are evolving and spreading across humans, cattle and the environment in the United States.