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Table 1 Intensity of IF positive cells expressing SARS-CoV-2 S protein

From: Evaluation of SARS-CoV-2 neutralizing antibodies using a vesicular stomatitis virus possessing SARS-CoV-2 spike protein

Hospitalized COVID-19 patient sera COVID-19 PCR-negative donor sera
No IF-Intensity No IF-Intensity
1  +  +  +  1
2  +  +  +  2
3  +  +  3
4  +  +  +  4
5  +  +  +  5
6  +  +  +  6
7  +  +  +  7
8  +  +  +  8
9  +  +  +  9
10  +  +  10
11  +  +  +  11
12  +  +  +  12
13 13
14 14
15 15
16 16
17 17
18  +  18
19 19
20  +    
21  +  +    
22  +  +    
23  +  +    
  1. SARS-CoV-2 S protein-expressing BHK cells were reacted with the hospitalized COVID-19 patient sera or COVID-19 PCR-negative donor sera. IF-Intensity was evaluated by observation under a fluorescence microscope. IF-Intensity was stronger in the order of +  +  +  >  +  +  >  +  > –