Shorter Incubation Period among Unvaccinated Delta Variant Coronavirus Disease 2019 Patients in Japan
Bibliographic Data
| ID | 15503147 |
|---|---|
| Authors | Tsuyoshi Ogata (0000-0002-3261-888X, Osaka Prefectural Government, corresponding author), Harumi Tanaka (0000-0001-9033-0035, Osaka Prefectural Government), Hideo Tanaka (Fujiidera Public Health Center of Osaka Prefectural Government, Fujiidera 583-0024, Japan), Fujiko Irie (0000-0002-9074-2213, Osaka Prefectural Government), Atsushi Hirayama (0000-0002-6712-6930, Osaka Prefectural Government), Yuki Takahashi (0000-0002-6711-8295, Osaka Prefectural Government) |
| Year | 2022 |
| Volume | 19 |
| Issue | 3 |
| Pages | 1127-1127 |
| Publication date | 2022-01-20 |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | International Journal of Environmental Research and Public Health (JOURNAL) |
| Journal identifiers | ISSN: 1661-7827 • E-ISSN: 1660-4601 |
| Publisher | Multidisciplinary Digital Publishing Institute (PUBLISHER • CH) |
| DOI | 10.3390/ijerph19031127 |
| PMID | 35162151 |
| OpenAlex | W4206507709 |
| Language | EN |
| Citations received | 4 |
| References cited | 27 |
Few studies have assessed incubation periods of the severe acute respiratory syndrome coronavirus 2 Delta variant. This study aimed to elucidate the transmission dynamics, especially the incubation period, for the Delta variant compared with non-Delta strains. We studied unvaccinated coronavirus disease 2019 patients with definite single exposure date from August 2020 to September 2021 in Japan. The incubation periods were calculated and compared by Mann-Whitney U test for Delta (with L452R mutation) and non-Delta cases. We estimated mean and percentiles of incubation period by fitting parametric distribution to data in the Bayesian statistical framework. We enrolled 214 patients (121 Delta and 103 non-Delta cases) with one specific date of exposure to the virus. The mean incubation period was 3.7 days and 4.9 days for Delta and non-Delta cases, respectively ( p -value = 0.000). When lognormal distributions were fitted, the estimated mean incubation periods were 3.7 (95% credible interval (CI) 3.4-4.0) and 5.0 (95% CI 4.5-5.6) days for Delta and non-Delta cases, respectively. The estimated 97.5th percentile of incubation period was 6.9 (95% CI 5.9-8.0) days and 10.4 (95% CI 8.6-12.7) days for Delta and non-Delta cases, respectively. Unvaccinated Delta variant cases had shorter incubation periods than non-Delta variant cases
Biology · Coronavirus · Coronavirus disease 2019 (COVID-19 · Delta · Disease · Incubation · Incubation period · Infectious disease (medical specialty · Percentile · Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2 · Statistics · COVID-19 epidemiological studies · Medicine · SARS-CoV-2 and COVID-19 Research · SARS-CoV-2 detection and testing · Internal Medicine
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| Citations per year | 1 |
|---|---|
| Citation span | 2022 - 2023 (2) |
| Highly cited | No |