Vaccinating animals against Salmonella

Breeding animals often suffer from diarrhoea caused by Salmonella, but since the bacterium is constantly changing, previous vaccines quickly become ineffective. Wolf-​Dietrich Hardt, Emma Wetter Slack and Médéric Diard have developed a vaccine that exploits this genetic modification. Their vaccine triggers an immune response that directs the evolution of Salmonella in such a way that the only survivors are harmless pathogens that are also difficult to transmit to other animals.