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In this lecture we cover host barriers against virus infections, which include chemical and physical defenses such as skin and mucus; intrinsic defenses (always present in the cell), and then innate defenses (which must be induced by infection). Both are highly effective antiviral systems, but are antagonized by many different viral proteins, one reason why viruses are successful at being maintained in populations. Note: this is a corrected version of a previously uploaded video that was missing one of the
