Innate

Your immune response is divided into systems. The first frontline defense your body has is known as the innate immune system. The skin is our first defense against pathogens and offers a physical barrier around the body. Then there’s mucus. Snot acts like quicksand for pathogens, which become stuck in its grasp and are prevented from making it any further into the body. For those sneaky pathogens that make it past these first two lines of defense, they might find their way into the stomach, which is filled with acid that kills them off. Also, the digestive system is home to healthy bacteria that compete with invading bacteria for space and food, sometimes leading to the demise of the invading bacteria.