Results of contact tracing for SARS-CoV-2 Omicron sub-lineages (BA.4, BA.5, BA.2.75) and the household secondary attack risk.

Osong Public Health Res Perspect · 2023 · PMC10522828 · PMID 37415434

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an observed trendno p-value reported

However, an observed trend indicated a decrease in the secondary attack rate with an increase in vaccinations among household members of confirmed BA.5 and BA.2.75 cases.

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