Which one is the major initial step in the infection process? a. Colonization b. Invasion c. Toxigenicity d. Adherence

The major initial step in the infection process is:<br /><br />d. Adherence<br /><br />Adherence, also known as attachment, is the first step in the infection process. It involves the pathogen binding to the surface of the host cell or tissue. This initial interaction is crucial for the pathogen to establish itself within the host and initiate infection.