The initial exposure of an individual to an antigen is referred to as what?

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The initial exposure to an antigen is referred to as sensitization, which leads to the development of an immune response against the antigen. Allergy and hypersensitivity are types of immune responses that can occur after sensitization. Active immunity is a type of immunity that is acquired after exposure to an antigen, either through infection or vaccination.

The Initial Exposure of an Individual to an Antigen Is