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Table 1 Summary of nursery outbreaks in England that were reported to Public Health England (PHE) between 02 November 2020 and 31 January 2021

From: A cross-sectional national investigation of COVID-19 outbreaks in nurseries during rapid spread of the Alpha (B.1.1.7) variant of SARS-CoV-2 in England

 

Month

Overall

November 2020

December 2020

January 2021

 

Number of outbreaks

64 (37%)

43 (25%)

66 (38%)

173 (100%)

Median (IQR) cases per outbreak

5 (3–9)

11 (6.5–15.5)

10 (6–15)

8 (5–13)

Mode (range) of cases per outbreak

3 (2–20)

5 (2–31)

6 (2–33)

2 (2–33)

Cases in children

115 (27%)

146 (30%)

249 (34%)

510 (31%)

Cumulative incidence in children (95% confidence interval)

2.34% (1.94–2.81)

3.89% (3.30–4.57)

4.21% (3.72–4.77)

3.50% (3.21–3.81)

Cases in staff with direct contact with children

290 (68%)

309 (63%)

429 (58%)

1028 (62%)

Cumulative incidence in staff with direct contact with children (95% CI)

26.58% (24.00–29.33)

37.87% (34.45–41.31)

35.34% (32.66–38.11)

32.94% (31.30–34.62)

Cases in staff without contact with children

23 (5%)

36 (7%)

60 (8%)

119 (7%)

Cumulative incidence in staff without contact with children (95% CI)

11.56% (7.62–17.03)

21.95% (16.03–29.22)

26.55% (21.02–32.9)

20.20% (17.08–23.72)

Cases in all staff

313 (73%)

345 (70%)

489 (66%)

1147 (69%)

Cumulative incidence in all staff (%)

24.26% (21.97–26.72)

35.20% (32.23–38.30)

33.96% (31.52–36.48)

30.92% (29.44–32.44)

Total cases

428 (26%)

491 (30%)

738 (45%)

1657 (100%)

Total cumulative incidence %

6.90% (6.29–7.56)

10.36% (9.52–11.27)

10.04% (9.37–10.76)

9.06% (8.65–9.49)