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During infection the human body interacts intimately with the infectious pathogen. It is this interaction that determines disease outcome. Upon infection the protein NF-kappaB acts as a central signal transmitter of the innate immune system. This protein has two main functions: the activation of genes important for inflammation as well as those that secure survival of the cell. This dual role provides a mechanistic link between infections and cancer development, as seen during infection with the carcinogenic bacterium Helicobacter pylori. Bacteria that develop intracellularly, such as...