The RPR and VDRL tests differ from each other in which of the following ways?

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The RPR (Rapid Plasma Reagin) and VDRL (Venereal Disease Research Laboratory) tests both detect nonspecific antibodies that the body produces in response to infection with the bacterium Treponema pallidum, the causative agent of syphilis. The primary difference between them lies in the method for reading or visualizing the reaction. The RPR test uses charcoal particles to visualize flocculation, while the VDRL test uses a microscope to detect flocculation.

The RPR and VDRL Tests Differ from Each Other in Which