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COVID-19 Booster Frequency

The frequency of COVID-19 booster shots for continued protection against new SARS-CoV-2 variants, with public health bodies and recent studies recommending a flexible approach tied to individual risk factors and variant circulation.

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Jan 18, 2026
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How reliable are studies comparing COVID death percentages by vaccination status given reporting biases?

Studies that report COVID-19 death percentages by vaccination status can be informative but are frequently vulnerable to a constellation of reporting and design biases that complicate straightforward ...