Challenges to the Effectiveness and Immunogenicity of COVID-19 Vaccines: A Narrative Review with a Systematic Approach.

Vaccines (Basel) · 2025 · PMC12390424 · PMID 40872876

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showed a trendno p-value reported

Another study showed a trend toward a decrease in both IgG and IgM antibodies, compared with antibody levels at hospital discharge, within seven months after the onset of symptoms [ 77 ].

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