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. 2022 Jul 29;4(30):669–671. doi: 10.46234/ccdcw2022.032

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Copyright and License information: Editorial Office of CCDCW, Chinese Center for Disease Control and Prevention 2022

This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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The transmission characteristics and transmission chain of an outbreak of the COVID-19 Omicron variant in Zhuhai City, Guangdong Province, China, 2022. (A) The epidemic curve of 38 COVID-19 cases; (B) The transmission chain of 38 COVID-19 cases; (C) The R_t of the ongoing COVID-19 epidemic in Zhuhai City from January 12 to January 21, 2022.

Note: In Figure 1B, each dot represents an infection case, and the connecting line between them represents the transmission relationship. “ZS” City is Zhongshan City of Guangdong Province, “MZ” City is Meizhou City of Guangdong Province. In Figure 1C, the red dotted line indicated R_t=1, below which sustained transmission was unlikely so long as intervention measures were sustained, indicating that the outbreak was under control. The “R0” package of R software (version 3.6.0, R Core Team, Vienna, Austria) was used for the data analysis. Through gamma distribution fitting, the “EpiEstim” package was used to estimate the R_t since January 12. R₀ represents the basic reproduction number; R_t represents the effective reproduction number.

Abbreviation: COVID-19=coronavirus disease 2019.