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Table 2 Characteristics of SARS-CoV-2-positive samples from patient near surfaces (CT table/CT gantry)

From: Contamination of CT scanner surfaces with SARS-CoV-2 and infective potential after examination of invasively ventilated, non-invasively ventilated and non-ventilated patients with positive throat swabs: prospective investigation using real-time reverse-transcription PCR and viral cell culture

Group

No

Last patient Ct-value

STT (days)

Kind of mask/ventilation

Duration of examination (min)

Events during examination

Location

Ct-value

SARS-CoV-2 RNA copies/mL

Cell culture

Virus variant

Not/non-invasive ventilated

1

N/A

1*

FFP-2

9

Cough

Air Grid

38.94

39.2

Neg

N/A

2

 < 30

4

FFP-2

8

Cough

Table

37.36

4040

Neg

WT

3

 < 30

2

NIV

18

None

Air Grid

37.08

3210

Neg

WT

4.1

 < 30

7*

NIV

15

None

Gantry

38.02

490

Neg

WT

4.2

Table

37.24

2400

Neg

WT

4.3

Air Grid

37.37

1890

Neg

WT

5

 < 30

7

FFP-2

12

Cough

Table

37.98

547

Neg

B1.1.7

Invasive ventilated

1

 < 30

20*

Tube

21

None

Gantry

39.26

12.2

Neg

WT

2

 < 30

15

Tube

22

None

Air Grid

37.42

5730

Neg

WT

3

 > 30

35

Tube

20

None

Table

35.96

39,500

Neg

B1.1.7

4

 > 30

29*

TC

25

None

Air Grid

38.43

3060

Neg

WT

5

 < 30

26

Tube

30

None

Gantry

39.31

10.2

Neg

B1.1.7

  1. SARS-CoV-2: severe acute respiratory syndrome coronavirus type 2; Ct value: cycle threshold value of surface sample RT-PCR (reverse-transcription polymerase chain reaction); RNA: ribonucleic acid; Cell culture: result of viral cell culture; neg. = negative; STT: symptom to test time—time between symptom onset and CT examination, n*: cases in which symptom onset was unknown and date of first positive SARS-CoV-2 RT-PCR was set as symptom onset; Most recent Ct value: RT-PCR cycle threshold of the patient’s most recent SARS-CoV-2 smear test; N/A: Not applicable; FFP-2: filtering facepiece—2; NIV: non-invasive ventilation, Tube: endotracheal tube; TC: tracheal cannula; WT: SARS-CoV-2 virus wild type; B1.1.7: SARS-CoV-2 variant of concern B.1.1.7