Extended Data Fig. 5: Impact of bias due to misclassification of prior infection status.
From: Differential protection against SARS-CoV-2 reinfection pre- and post-Omicron

Impact of bias due to misclassification of prior infection status in the test-negative design, assuming 90% of SARS-CoV-2 infections are undocumented. The figure shows the simulated estimated effectiveness of infection against reinfection in presence of misclassification of prior infection status compared to the true effectiveness of infection against reinfection in the pre-omicron a) and omicron b) phases of the pandemic.