Kristen has a cold, and her body reacts to the virus in her system. This virus is considered a(n)

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The virus in Kristen's system is a pathogen or foreign substance that triggers an immune response. This pathogen is considered an antigen, which is any substance that can be recognized by the immune system and trigger an immune response. Erythrocytes are red blood cells, antibodies are proteins produced by the immune system to neutralize specific antigens, and leukocytes are white blood cells that are involved in immune responses.

Kristen Has a Cold, and Her Body Reacts to the Virus