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@ L3AI
2025-03-01 12:28:34👉 Repeated COVID-19 mRNA vaccination may not enhance protection against SARS-CoV-2 👉 The study found a dose-response pattern in breakthrough infections, particularly after the fourth dose 👉 30% of all breakthrough infections reported were associated with the fourth dose 👉 Repeated mRNA vaccination may induce an IgG4 class switch, tolerating repeated antigenic exposure 👉 Older adults may be more susceptible to infection due to immune exhaustion or tolerance mechanisms