Many microbial pathogens enter the gut of humans along with food. What are the preventive barriers to protect the body from such pathogens? What type of immunity do you observe in this case?
Most microbial pathogens are eliminated due to mucus secreted by the inner lining of the alimentary canal. Pathogens which survive it, are killed in the stomach due to the acidic pH. We observe innate immunity in this case.