Table 1 SARS-CoV-2 infectivity by the qualitative culture assay, corresponding RT-qPCR (Ct-values), and quantitative values of the TCID50 assay for different specimens.

From: Infectivity of exhaled SARS-CoV-2 aerosols is sufficient to transmit covid-19 within minutes

Individuals (no 1–3)

Sample Ct

Culture result (+/−)

Supernatant Ct

TCID50/mL

Exhaled TCID50/s

Aerosol samples

 1: breathing

–a

    

 1: talking

37.5

 + 

12.3

7.9 × 102

4

 1: singing

35.3

 + 

13.2

2.5 × 104

127

 2: breathing

–a

    

 2: talking

35.7

 + 

12.5

7.9 × 102

3

 2: singing

33.7

 + 

18.7

7.9 × 103

36

 3: breathing

36.4

 + 

32.9

–

 

 3: talking

37.0

−

33.9

–

 

 3: singing

38.2

 + 

13.3

7.9 × 102

4

NPH samples

1

32.6b

 + 

16.5

–

 

2

33.6b

 + 

13.0

7.9 × 102

 

3

35.2b

−

37.2

–

 

Saliva samples

1

39.3c

−

37.4

–d

 

2

25.1c

 + 

17.4

–d

 

3

18.6c

 + 

17.1

–d

 
  1. aNo RNA detected and therefore not cultivated.
  2. bCt-value after filtration through 0.22 µm filter. Original sample Ct-values were: 30.4, 24.4 and 25.1
  3. cCt-value from Alsved et al.12.
  4. dThe saliva samples only had material for the 12-well assay, and no TCID50 assay could be performed.
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