Question: 4. At time point A, the patient's IgG titer against antigen X is 1:6; the patient's IgM titer to the same antigen is zero.

4. At time point A, the patient's IgG titer against antigen X

4. At time point A, the patient's IgG titer against antigen X is 1:6; the patient's IgM titer to the same antigen is zero. Later, at time point B, the same patient encounters antigen X. The IgG titer to X is zero, and the IgM titer to X is 1:8. Describe a scenario that could explain these data.

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