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Title: What is the first line of defense and how do they prevent pathogens from entering our body? Post by: collingr on Nov 28, 2016 What is the first line of defense and how do they prevent pathogens from entering our body?
Title: Re: What is the first line of defense and how do they prevent pathogens from entering our body? Post by: bio_man on Nov 29, 2016 physical and chemical barriers (skin, mucous memb, HCL in stom, saliva, tears, oil/sweat)
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