Innate

“Innate, or nonspecific, immunity is the defense system with which you were born. It protects you against all antigens. Innate immunity involves barriers that keep harmful materials from entering your body [such as skin and mucous membranes]”

Source:

Medline Plus

https://medlineplus.gov/ency/article/000821.htm#:~:text=Innate%2C%20or%20nonspecific%2C%20immunity%20is,materials%20from%20entering%20your%20body