FIGURE 2.

(a) Distribution of diagnostic tests and kits based on techniques or test type. Figure created with Datawrapper. (b) Schematic representation of the timeline of COVID‐19 infection and test positivity by either PCR‐based, antigen‐test, serological (antibody titer) testing, and aptamer‐based assay/test. Notably, both PCR and antigen tests are positive earlier in the disease course, while serological tests are positive later in the disease course. Aptamer‐based diagnostics can detect the virus during the course of infection