Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2022 May 6;4(18):385-388.
doi: 10.46234/ccdcw2022.087.

Comparison of Omicron and Delta Variant Infection COVID-19 Cases - Guangdong Province, China, 2022

Ting Hu  1 , Meng Zhang  1 , Aiping Deng  1 , Yingtao Zhang  1 , Bosheng Li  1 , Yan Li  1 , Min Kang  1   2
Affiliations

Comparison of Omicron and Delta Variant Infection COVID-19 Cases - Guangdong Province, China, 2022

Ting Hu et al. China CDC Wkly. .

Abstract

What is already known about this topic?: The Omicron variant has been listed as a variant of concern, but the characteristics still remain unclear.

What is added by this report?: The vaccinated proportion of 65 imported coronavirus disease 2019 cases that were infected with Omicron variant in this study was 89.23%, which was higher than Delta cases. Most imported cases infected with Omicron were tested positive using polymerase chain reaction after entering Guangdong within 3 days, a shorter period than Delta.

What are the implications for public health practice?: Under this observation, the international travelers infected with Omicron variant were detected positive earlier after entry than those infected with Delta variant. Breakthrough infections occurred in most Omicron cases in this study, but vaccination was still effective to reduce the incidence of severe illness. Omicron surveillance should be strengthened.

Keywords: COVID-19; Delta; Epidemiology; Omicron.

PubMed Disclaimer

Conflict of interest statement

No conflicts of interest.

Figures

Figure 1
Figure 1
Symptoms among 65 COVID-19 cases infected with Omicron variant.
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

See all "Cited by" articles

References

    1. World Health Organization. Weekly epidemiological update on COVID-19 - 30 November 2021. 2021. https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---30-november-2021. [2022-1-17].

    1. Wang YP, Chen RC, Hu FY, Lan Y, Yang ZW, Zhan C, et al Transmission, viral kinetics and clinical characteristics of the emergent SARS-CoV-2 Delta VOC in Guangzhou, China. EClinicalMedicine. 2021;40:101129. doi: 10.1016/j.eclinm.2021.101129. - DOI - PMC - PubMed

    1. Zhang M, Xiao JP, Deng AP, Zhang YT, Zhuang YL, Hu T, et al. Transmission dynamics of an outbreak of the COVID-19 Delta variant B.1.617.2 - Guangdong province, China, May–June 2021. China CDC Wkly 2021;3(27):584 − 6. http://dx.doi.org/10.46234/ccdcw2021.148.

    1. World Health Organization. Weekly epidemiological update on COVID-19 - 28 December 2021. 2021. https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---28-december-2021. [2022-1-17].

    1. Chen JH, Wang R, Gilby NB, Wei GW Omicron variant (B1.1.529): infectivity, vaccine breakthrough, and antibody resistance. J Chem Inf Model. 2022;62(2):412–22. doi: 10.1021/acs.jcim.1c01451. - DOI - PMC - PubMed

LinkOut - more resources