Portal of Exit

Human blood cells, high magnified under microscope — Photo: Human blood cells, high magnified under microscope

A portal of exit is the path that an organism takes to leave or vacate its reservoir.

The common portals of exit include:

via respiratory tract
via genitourinary tract
via gastrointestinal tract
skin (non-intact or broken) or mucous membranes e.g. eyes, nose, mouth
bleeding