Immune correlates analysis of the mRNA-1273 COVID-19 vaccine efficacy clinical trial

🤖 Plain-English Summary

In the coronavirus efficacy (COVE) phase 3 clinical trial, vaccine recipients were assessed for neutralizing and binding antibodies as correlates of risk for COVID-19 disease and as correlates of protection. Vaccine recipients with postvaccination 50% neutralization titers 10, 100, and 1000 had estimated vaccine efficacies of 78% (95% confidence interval, 54 to 89%), 91% (87 to 94%), and 96% (94 to 98%), respectively.

🔑 Key Findings

• These immune markers were measured at the time of second vaccination and 4 weeks later, with values reported in standardized World Health Organization international units.
• All markers were inversely associated with COVID-19 risk and directly associated with vaccine efficacy.
• Vaccine recipients with postvaccination 50% neutralization titers 10, 100, and 1000 had estimated vaccine efficacies of 78% (95% confidence interval, 54 to 89%), 91% (87 to 94%), and 96% (94 to 98%), respectively.

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