Table 1 Summary Statistics (primary cases and contacts reported separately)

^aUnvaccinated includes individuals with partial vaccination (24 primary cases and 18 contacts). ^bFully vaccinated includes unvaccinated individuals with previous infection.
Notes: Summary statistics for primary cases are shown separately from summary statistics for household contacts, secondary cases and secondary attack rate (SAR). For example, there were 2018 primary cases aged 0–9 years with Omicron BA.2 and a total of 4922 contacts aged 0–9 years living in households infected with Omicron BA.2. Of the 4922 household contacts, 1946 tested positive, yielding a SAR of 40%. Thus, the SAR reflects the proportion of household contacts that tested positive, irrespective of the characteristics of the primary case. Summary statistics stratified by the primary case level are presented in Tables S4 and S5. The proportions (%) for each category is presented in Table S3.

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