Different strains of Salmonella behave in different ways. Understanding how and why four closely related strains evolved to lead a more host adapted invasive life-style is at the heart of new research into the evolution of Salmonella microorganisms. Paul Barrow, Professor of Veterinary Infectious Diseases at the School of Veterinary Medicine and Science, has worked with colleagues in the Sanger Institute at Cambridge for a number of years on the Salmonella strains, S. Gallinarum and S. Pullorum in chickens and S. Dublin in cattle. All three strains cause typhoid-like symptoms in chickens and cattle and they are also closely related to S. Enteritidis—the bug that causes severe food-poisoning in humans.
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