British scientists have identified a way in which Salmonella, the bacteria that cause typhoid fever and gastroenteritis, inactivate immune defenses in human cells. This image shows Salmonella bacteria, green, invading a human red blood cell (Kieran McGourty et al / Imperial College London) One way in which human cells fight off infections is by engulfing the smaller bacterial cells and then attacking them with toxic enzymes contained in small packets...
