Volume 29, Number 3—March 2023
Dispatch
SARS-CoV-2 Incubation Period during the Omicron BA.5–Dominant Period in Japan
Tsuyoshi Ogata
and Hideo Tanaka
and Hideo Tanaka
Table 1
Estimated overall mean incubation periods and means within percentiles for Omicron and Delta variants in study of SARS-CoV-2 incubation period during the Omicron BA.5-dominant period in Japan*
| Distribution† | BA.5-dominant period, n = 122 | BA.1-dominant period, n = 68 | Delta-dominant period, n = 76 |
|---|---|---|---|
| Overall mean | 2.6 (2.5–2.8) | 2.9 (2.6–3.2) | 3.7 (3.4–4.0) |
| 5th percentile | 1.2 (1.1–1.4) | 1.2 (1.0–1.5) | 1.8 (1.5–2.1) |
| 25th percentile | 1.9 (1.8–2.0) | 2.0 (1.8–2.3) | 2.7 (2.4–3.0) |
| 50th percentile (median) | 2.5 (2.3–2.7) | 2.7 (2.5–3.0) | 3.5 (3.2–3.8) |
| 75th percentile | 3.2 (3.0–3.5) | 3.6 (3.3–4.0) | 4.5 (4.1–4.9) |
| 95th percentile | 4.5 (4.1–4.9) | 5.2 (4.6–5.9) | 6.1 (5.5–6.8) |
*Values are mean no. days (95% CI). Means were calculated by fitting to gamma distribution model for SARS-CoV-2 infections during Omicron BA.5–dominant and BA.1–dominant and Delta-dominant periods. †Distribution of patients within incubation period.
Page created: January 05, 2023
Page updated: February 20, 2023
Page reviewed: February 20, 2023
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