Humans have innate immunity for protection against pathogens that may enter the gut along with food. What are the two barriers that protect the body from such pathogens?

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Microbial pathogens enter the gut of humans along with food: 

 Physical barriers: Mucus coating of the epithelium lining the gastrointestinal tract helps in trapping microbes entering our body. 

 Physiological barriers: Acid in the stomach, saliva in the mouth prevent microbial growth.

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