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Fig. 1 | BMC Public Health

Fig. 1

From: Quantitative comparison of SARS-CoV-2 nucleic acid amplification test and antigen testing algorithms: a decision analysis simulation model

Fig. 1

Modeled algorithms for SARS-CoV-2 NAAT and antigen testing. Each panel illustrates the testing strategy utilized for one of the modeled algorithms. Algorithm abbreviations and descriptions – A NAAT Only: each person tested receives a NAAT (such as an RT-PCR test); B Ag Only: each person tested a single antigen test; C NAAT Confirmation for Sx/Ag-neg and Asx/Ag-pos: each person receives an antigen test and NAAT is used to confirm diagnoses in persons for whom antigen results do not match binary symptom status (e.g., a symptomatic person whose antigen result is negative); D NAAT Confirmation of Ag-neg: each person receives an antigen test and NAAT is used to confirm negative antigen test results; (E) Repeat Ag Confirmation of Ag-neg: each person receives an antigen test and, for those with initial negative results, a repeat antigen test (performed within approximately 30 min of the initial test) is used to confirm negative diagnoses; F NAAT for Asx & Sx/Ag-pos: – asymptomatic persons receive a NAAT, while symptomatic persons receive an antigen test followed by a NAAT for those with positive antigen results

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