Bivalent mRNA vaccine effectiveness against COVID-19 among older adults in Japan: a test-negative study from the VENUS study.

BMC Infect Dis · 2024 · PMC10823731 · PMID 38287337

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an increasing trendno p-value reported

Furthermore, the prevalence of positive results per week showed an increasing trend, with 29.0% of the tests conducted on December 24–30, 2022 producing positive results.

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