| Summary: | Surprisingly what separates us from the open environment all around us sometimes is a single layer of epithelial cells. It is at these seemingly fragile sites that most pathogens, including HIV, influenza, emerging and biodefense agents, gain access to our inside milieu. While there are major similarities between the cells and the immune responses generated at the mucosal membranes of the gastrointestinal and respiratory tracts together with the genitourinary tract, there are also important differences. Knowledge of these differences and similarities is required in order to understand the inte.
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