Table 3.

Findings suggestive of severe acute respiratory syndrome coronavirus 2 in patients with coronavirus disease 2019 (extracted from Table 2)

Finding	Viral Protein by Immunohistochemistry	Viral Protein by Immunofluorescence	Viral RNA by In situ Hybridization	Viral RNA by RT-PCR
Frequency of findings from patients examined	18/94 (19%)	10/13 patients (77%)	11/84 patients (13%)	71/144 (49%)
References showing detection	(13,70,81,82)	(9,13,69 and Ichimura et al., unpublished observations)	(13,69,70,97)	(69,70,81,83–85)
References showing no detection	(25,73,77,97–101)	–	(24,25,28,32,33,73, 77,87,100,101)	(27,34,36,77,99,101,102)