Answer
First, the pathogen must access a host cell through the skin or another route of entry. Second, the pathogen must then attach itself to the host cell. Third, the pathogen must be able to evade the body's numerous defense mechanisms long enough to become hazardous and wreak havoc upon the body's immune system.
Work Step by Step
First, the pathogen must access a host cell through the skin or another route of entry. Second, the pathogen must then attach itself to the host cell. Third, the pathogen must be able to evade the body's numerous defense mechanisms long enough to become hazardous and wreak havoc upon the body's immune system.
