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Forest plot representing the estimated sensitivity of studies on RT-qPCR analysis of salivary fluid for SARS-CoV-2 RNA, sub-analysis for case-control studies. Pooled sensitivity was 80.4% (95%CI 53.9–90.1), resulting from 83.4% (95%CI 59.9-94.4) for diachronous studies, and 78.1% (95%CI 55.5-91.1) for synchronous studies. Heterogeneity was substantial (I2, 79%), for both synchronous (I2, 81%) and diachronous studies (I2 = 69%)
