11/6—Incubation: 5.24 days, but as long as 24 days "in some special cases" [Rapid review]
Epidemiologic, clinical, and laboratory findings of the COVID-19 in the current pandemic: systematic review and meta-analysis
We collected 11,366 records after removing duplications. After three batches of screening, 127 records were included in this review. The result suggested that the mean incubation period was 5.24 days (95% CI:3.97–6.50, 5 studies), and ranged from 3 to 7.4 days. However, the incubation period in some special cases could be as long as 24 days.
Incubation Period of Severe Acute Respiratory Syndrome Novel Coronavirus 2 that Causes Coronavirus Disease 2019: A Systematic Review and Meta-Analysis
Our search identified 206 studies, amongst which 18 studies, representing 22,595 participants were included in the final analysis. The pooled average incubation period of SARS-CoV-2 was 5.7 days (95% CI, 5.1–6.4). Subgroup analyses by geographic location showed that the pooled average incubation period of SARS-CoV-2 was 6.1 days (95% CI, 5.34–6.94) in China and 4.54 (95% CI, 3.9–5.2) in other countries (Singapore, South Korea, and globally).
Meta-analysis of several epidemic characteristics of COVID-19
The estimate of the mean of the incubation period of COVID-19 based on our meta-analysis is 5.34 (days), with a 95% confidence interval [4.29, 6.40] and a 95% prediction interval [1.97, 8.73].
Epidemiological characteristics of COVID-19: a systematic review and meta-analysis
Out of 1675 non-duplicate studies, 43 were included in the meta-analysis. The pooled mean incubation period was 5.68 (99% confidence interval [CI]: 4.78, 6.59) days. The pooled mean number of days from the onset of COVID-19 symptoms to first clinical visit was 4.92 (95% CI: 3.95, 5.90), ICU admission was 9.84 (95% CI: 8.78, 10.90), recovery was 18.55 (95% CI: 13.69, 23.41), and death was 15.93 (95% CI: 13.07, 18.79). Pooled CFR among confirmed COVID-19 patients was 0.02 (95% CI: 0.02, 0.03).
Incubation period of COVID-19: a rapid systematic review and meta-analysis of observational research
After initial eligibility screening, 24 studies were selected for initial review, nine of these were shortlisted for meta-analysis. Final estimates are from meta-analysis of eight studies. The corresponding mean (95% CIs) was 5.8 (95% CI 5.0 to 6.7) days. The pooled parameter estimates (95% CIs) resulted in a median incubation period of 5.1 (95% CI 4.5 to 5.8) days, whereas the 95th percentile was 11.7 (95% CI 9.7 to 14.2) days.
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