A nationwide study by the U.S. Centers for Disease Control and Prevention (CDC) is the first to show resistance to severe COVID-19 begins to wane 4 months after receiving the third dose of mRNA vaccine
A new study shows that resistance to severe COVID-19 begins to wane 4 months after receiving the third dose of mRNA vaccine. A decay of immunity was observed during both Delta and Omicron variants waves. Although similar to the second dose, protection decreased over time after the third dose, the third dose was still very effective in preventing severe COVID-19 disease.
"mRNA vaccines, including boosters, are very effective, but their effective...
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