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Table 1 Characteristics of the different clusters

From: A systematic outbreak investigation of SARS-CoV-2 transmission clusters in a tertiary academic care center

 

Cluster A

(internal medicine ward)

Cluster B

(internal medicine ward)

Cluster C

(surgical ward)

Cluster D

(surgical ward)

People affected, n (patients /HCW)

13 (8/5)

16 (12/4)

27 (10/17)

44 (10/34)

 WGS available, n (%)

     Patients, n (%)

     HCWs, n (%)

9 (69.2%)

5/8 (62.5%)

4/5 (80.0%)

10 (62.5%)

8/12 (66.7%)

2/4 (50.0%)

21 (77.8%)

7/10 (70.0%)

14/17 (82.4%)

30 (68.2%)

8/10 (80.0%)

22/34 (64.7%)

Transmission among people with available sequencing data

    

 Confirmed, n (%)

5* (55.6%)

6 (60.0%)

8 (38.1%)

14 (46.7%)

 Ruled out, n (%)

4 (44.4%)

4 (40.0%)

13 (61.9%)

16 (53.3%)

People with genetically identical strains, n (%)

Patients /HCW

5* (38.5%)

4/1

6 (37.5%)

5/1

8 (29.6%)

2/6

14 (31.8%)

4/10

 Direct exposure

    

      Exposure between patients

0

3

0

3

      Exposure between patient and HCW

0

1 (HCW)

1 (P), 1 (HCW)

0

  Ward-based exposure

4 (P), 1 (HCW)

2 (P)

1 (P), 5 (HCW)

1 (P), 10 (HCW)

People with genetically distinct strains, n (%)

Patients /HCW

4 (30.8%)

1/3

4 (25.0%)

3/1

13 (48.1%)

5/8

16 (36.4%)

4/12

 Direct exposure

    

      Exposure between patients

1

3

0

3

      Exposure between patient and HCW

1 (HCW)

1 (HCW)

3 (HCW)

2 (HCW)

  Ward-based exposure

2 (HCW)

0

5 (P), 5 (HCW)

1 (P), 10 (HCW)

People with missing sequencing data, n (%)

Patients /HCW

4 (30.8%)

3/1

6 (37.5%)

4/2

6 (22.2%)

3/3

14 (31.8%)

2/12

 Direct exposure

    

      Exposure between patients

2

2

3

0

      Exposure between patient and HCW

0

0

0

3 (HCW)

 Ward-based exposure

1 (P), 1 (HCW)

2 (P), 2 (HCW)

3 (HCW)

2 (P), 9 (HCW)

Main virus lineage

B.1.160

B.1.160

B.1.177

B.1.177

Department screenings, n (Patients /HCW)

2/2

3/0

2/2

3/2

Clinical course (Patients)

    

 Asymptomatic

2

0

6

2

 Symptomatic

2

9

3

6

 Deceased

4

2

0

2

 Unknown

0

1

1

0

  1. *Consists of two different clusters (two and three identical virus-strains, respectively)
  2. HCW  Health-care worker, WGS  Whole genome sequencing, P  Patient