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Table 1 Incubation period, rates of emergency department visit and intensive care unit admission compared during the period before and after Delta and omicron emergence

From: SARS-CoV-2 infection in pediatric population before and during the Delta (B.1.617.2) and Omicron (B.1.1.529) variants era

 

Before Delta and omicron emergence

After Delta emergence

After Omicron emergence

References

Median Incubation period

5–7.5 days

3.7–6 days

2–3 days

[77, 78]

Emergency department visit

0–4 years

NI

21.01%

3.89%

[61]

5–11 years

NI

12.62%

3.60%

[61]

Intensive care unit admission rate

Under 1 year

NI

14.00%

9.90%

[23]

< 18 years

26.5%

0.10%

23.2%

1.40%

NI

NI

[120]

[54]