When a pathogen enters the body it first encounters what?

When a pathogen enters the body, it first encounters the body's physical and chemical barriers, primarily the skin and mucous membranes. These barriers serve as the first line of defense, preventing pathogens from penetrating deeper into the body. Additionally, secretions like saliva, mucus, and tears contain antimicrobial proteins that can neutralize or inhibit the growth of pathogens. If these barriers are breached, the immune system's innate responses come into play to fight the infection.