The inevitable, but unpredictable, appearance of new infectious diseases has been recognized for centuries well before the discovery of causative infectious agents. Today, however, despite advances in development of therapeutics, and vaccines the ease of world travel and increased global interdependence have added layers of complexity to containing these infectious diseases that affect not only the health but the economic stability of societies. Viruses and bacteria and other pathogens impose enormous pressures on their human hosts, and combatting these pathogens is fundamental to the propagation of a species. Innate immunity provides the foundation for pathogen resistance.
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