eCite Digital Repository

Estimation of the incubation period of COVID19 in Vietnam


Bui, LV and Nguyen, HT and Levine, H and Nguyen, HN and Nguyen, T-A and Nguyen, TP and Nguyen, TT and Do, TTT and Pham, NT and Bui, MH, Estimation of the incubation period of COVID19 in Vietnam, PloS One, 15, (12) Article 0243889. ISSN 1932-6203 (2020) [Refereed Article]


Copyright Statement

Copyright 2020 Bui et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1371/journal.pone.0243889


Objective: To estimate the incubation period of Vietnamese confirmed COVID-19 cases.

Methods: Only confirmed COVID-19 cases who are Vietnamese and locally infected with available data on date of symptom onset and clearly defined window of possible SARS-CoV-2 exposure were included. We used three parametric forms with Hamiltonian Monte Carlo method for Bayesian Inference to estimate incubation period for Vietnamese COVID-19 cases. Leave-one-out Information Criterion was used to assess the performance of three models.

Results: A total of 19 cases identified from 23 Jan 2020 to 13 April 2020 was included in our analysis. Average incubation periods estimated using different distribution model ranged from 6.0 days to 6.4 days with the Weibull distribution demonstrated the best fit to the data. The estimated mean of incubation period using Weibull distribution model was 6.4 days (95% credible interval (CrI): 4.89-8.5), standard deviation (SD) was 3.05 (95%CrI 3.05-5.30), median was 5.6, ranges from 1.35 to 13.04 days (2.5th to 97.5th percentiles). Extreme estimation of incubation periods is within 14 days from possible infection.

Conclusion: This analysis provides evidence for an average incubation period for COVID-19 of approximately 6.4 days. Our findings support existing guidelines for 14 days of quarantine of persons potentially exposed to SARS-CoV-2. Although for extreme cases, the quarantine period should be extended up to three weeks.

Item Details

Item Type:Refereed Article
Keywords:COVID-19, incubation period, estimation, modelling
Research Division:Health Sciences
Research Group:Public health
Research Field:Preventative health care
Objective Division:Health
Objective Group:Public health (excl. specific population health)
Objective Field:Preventive medicine
UTAS Author:Nguyen, TP (Ms Thuy Nguyen)
ID Code:142670
Year Published:2020
Web of Science® Times Cited:8
Deposited By:Menzies Institute for Medical Research
Deposited On:2021-02-04
Last Modified:2022-12-06
Downloads:16 View Download Statistics

Repository Staff Only: item control page