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. 2023 Sep;85:68–85. doi: 10.1016/j.annepidem.2023.05.002

Fig. 4.

Fig. 4

Bars represent the number of studies with used combinations of sample types (horizontal axis) and inactivation types (colors) for SARS-CoV-2 positive samples in at least one trial of the corresponding study. (A) shows the sample and inactivation combinations for training samples, while (B) represents combinations used in the diagnostic test evaluations (DTEs). Please note that individual studies might have used multiple combination options. BPL, beta propiolactone; UV, ultraviolet radiation.