Host immunity

Host immunity is the body's natural defense system against infections like bacteria, viruses, and other harmful agents. It involves a complex network of cells, tissues, and proteins that identify and attack invaders to prevent illness. When the body detects a threat, immune cells respond quickly by destroying the invaders or marking them for destruction. This system also remembers past infections, allowing faster responses in future encounters. Overall, host immunity is essential for maintaining health by protecting the body from infections while distinguishing harmful pathogens from the body's own cells.