The change from negative serum, without antibodies specific to an infecting agent, to positive serum, containing antibodies against that infecting agent, is called

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Seroconversion refers to the change from negative serum to positive serum, indicating the presence of antibodies against a specific infecting agent. ELISA (A) and RIA (D) are both types of serological tests used to detect specific antibodies in serum, but they do not specifically refer to the change from negative to positive. Complement fixation (B) is a type of serological test used to detect the presence of specific antibodies, but it does not refer to the change from negative to positive.

The Change from Negative Serum, Without Antibodies Specific to an Infecting