The incubation period for COVID-19 spans a specific number of days on average
Multiple systematic reviews and empirical studies confirm that the incubation period for COVID-19 spans a specific number of days on average, typically falling between 3 and 7 days depending on the viral variant and methodology.
Numerous published studies and meta-analyses provide precise average values for the COVID-19 incubation period, demonstrating that it can be quantified effectively despite minor variations across different viral strains and patient demographics.
J. A. Quesada, A. López-Pineda, V. Gil-Guillen, J. M. Arriero-Marín, F. Gutiérrez, C. Carratalá-Munuera. Incubation period of COVID-19: A systematic review and meta-analysis. 2020. https://doi.org/10.1016/j.rceng.2020.08.002
This systematic review and meta-analysis establishes specific mean incubation periods for COVID-19 ranging between 5.6 and 6.7 days depending on the statistical model.
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Xiangyanyu Xu, Yanpeng Wu, A. G. Kummer, Yuchen Zhao, Zexin Hu, Yan Wang, Hengcong Liu, M. Ajelli, Hongjie Yu. Assessing changes in incubation period, serial interval, and generation time of SARS-CoV-2 variants of concern: a systematic review and meta-analysis. 2023. https://doi.org/10.1186/s12916-023-03070-8
This study evaluates variant-specific incubation periods, reporting pooled estimates such as 3.49 days for the Omicron BA.1 variant.
S. W. Park, K. Sun, S. Abbott, R. Sender, Y. Bar-On, J. Weitz, S. Funk, B. Grenfell, J. Backer, J. Wallinga, C. Viboud, J. Dushoff. Inferring the differences in incubation-period and generation-interval distributions of the Delta and Omicron variants of SARS-CoV-2. 2022. https://doi.org/10.1073/pnas.2221887120
This research estimates mean incubation periods of 3.8 to 4.5 days for Delta and Omicron variants when accounting for epidemic dynamics.
Zihao Guo, Shi Zhao, C. K. Mok, R. T. So, C. Yam, T. Chow, T. Chan, Yuchen Wei, Katherine Jia Min, M. Wang, K. Chong, E. Yeoh. Comparing the incubation period, serial interval, and infectiousness profile between SARS‐CoV‐2 Omicron and Delta variants. 2023. https://doi.org/10.1002/jmv.28648
This study reports estimated mean incubation periods of 3.4 days for Omicron and 3.8 days for Delta variants in Hong Kong.
Yehya M. Althobaity, Jianhong Wu, Michael Tildesley. A comparative analysis of epidemiological characteristics of MERS-CoV and SARS-CoV-2 in Saudi Arabia. 2022. https://doi.org/10.1016/j.idm.2022.07.002
This study calculates a mean COVID-19 incubation period of 5.43 days based on contact tracing data in Saudi Arabia.
Valentina Viego, Milva Geri, Juan Castiglia, Ezequiel Jouglard. Incubation period and serial interval of Covid-19 in a chain of infections in Bahia Blanca (Argentina). 2020. https://doi.org/10.1101/2020.06.18.20134825
This regional study estimates a mean incubation period of 7.9 days and a median of 6.1 days for symptomatic patients in Argentina.
Tianchen Zhang, Sheng Ding, Z. Zeng, Huijian Cheng, Chengfeng Zhang, Xiangqun Mao, H. Pan, G. Xia, Daping Che. Estimation of Incubation Period and Serial Interval for SARS-CoV-2 in Jiangxi, China, and an Updated Meta-Analysis.. 2021. https://doi.org/10.3855/jidc.14025
This updated meta-analysis establishes a pooled mean incubation period of 6.25 days for SARS-CoV-2.
Caitlin Daley, Megan Fydenkevez, Shari Ackerman-Morris. A Systematic Review of the Incubation Period of SARS-CoV-2: The Effects of Age, Biological Sex, and Location on Incubation Period. 2020. https://doi.org/10.1101/2020.12.23.20248790
This systematic review reports an overall mean and median incubation period for SARS-CoV-2 of 5.894 days and 5.598 days, respectively.
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