Table 1.

Results of Testing of Nasopharyngeal Swab and Saliva for SARS-CoV-2 RNA in Hospitalized Patients With COVID-19, by Time From Illness Onset to Collection of Sample Pair

	No. of Patients (%)
Time From Illness Onset to Specimen Collection	With NP Swabs and Saliva Both Positive	With NP Swab Only Positive	With Saliva Only Positive	With NP Swab and Saliva Both Negative
0–7 days (n = 18)	14 (78)	2 (11)	1 (6)	1 (6)
8–14 days (n = 43)	21 (49)	13 (30)	4 (9)	5 (12)
≥15 days (n = 30)	9 (30)	5 (17)	3 (10)	13 (43)
Any (n = 91)	44 (48)	20 (22)	8 (9)	19 (21)

N = 91.

Abbreviations: COVID-19, coronavirus disease 2019; NP, nasopharyngeal; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.