Figure 3A: Largest local "bar and band" cluster of 106 cases

Figure 3B: Cluster of 21 cases linked to a wedding (at least 7 secondary infections)

Figure 3C: SSE of undetermined origin was associated with religious activities at a local temple and resulted in 11 primary cases and 18 recorded cases total

Figure 3D:  All other local cluster cases and chains of SARS-CoV-2 transmission in Hong Kong


University of Michigan - Ann Arbor

The largest local cluster was 106 cases and was traced back to multiple social exposures among a collection of bars across Hong Kong (Figure 3A). Of the 73 primary bar cases, 39 customers, 20 staff, and 14 musicians were infected, while the remaining 33 infections were secondary, tertiary or quaternary contacts.
This single outbreak accounts for 10.2% (106/1,038) of all cases in Hong Kong regardless of the source, but 30.4% of all local cases acquired in Hong Kong (106/349).

Transmission within families was the most frequent event among all recognized transmission pairs (96/171; 56.1%) followed by transmission in social settings (55/171; 32.2%) and at work (20/171; 11.1%). However, there was very strong evidence that the number of individual secondary cases resulting from social exposures was significantly higher compared to work or family exposures (μ = 2.89 vs. 1.36; p < 0.001, negative binomial regression model). 

Chains of SARS-CoV-2 transmission in Hong Kong

Dillon Adam, Peng Wu, Jessica Wong et al. Clustering and superspreading potential of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections in Hong Kong, 21 May 2020, PREPRINT (Version 1) available at Research Square [+https://doi.org/10.21203/rs.3.rs-29548/v1+]
https://www.researchsquare.com/article/rs-29548/v1

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