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TABLE 1

SARS-CoV-2 Incidence and Vaccine Effectiveness Among Sixth to Twelfth Grade Students

Number of EventsTotal Person- Days at RiskIncidence Rate per 1000 Person-DaysIncidence Rate Ratio (95% CI)Vaccine Effectiveness,% (95% CI)
Documented SARS-CoV-2 infectionsa      
 Unvaccinated 20 29 572 0.676 8.2 (3.5–19.4) 87.8 (71.2–94.8) 
 Vaccinated 84 953 0.082 Reference  
Symptomatic SARS-CoV-2 infectionsb      
 Unvaccinated 16 29 572 0.541 9.2 (3.4–25.1) 89.1 (70.3–96.0) 
 Vaccinated 84 953 0.059 Reference  
Number of EventsTotal Person- Days at RiskIncidence Rate per 1000 Person-DaysIncidence Rate Ratio (95% CI)Vaccine Effectiveness,% (95% CI)
Documented SARS-CoV-2 infectionsa      
 Unvaccinated 20 29 572 0.676 8.2 (3.5–19.4) 87.8 (71.2–94.8) 
 Vaccinated 84 953 0.082 Reference  
Symptomatic SARS-CoV-2 infectionsb      
 Unvaccinated 16 29 572 0.541 9.2 (3.4–25.1) 89.1 (70.3–96.0) 
 Vaccinated 84 953 0.059 Reference  

CI, confidence interval; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.

a

Documented SARS-CoV-2 infection includes both symptomatic and asymptomatic infections.

b

Students with asymptomatic SARS-CoV-2 infection were censored at time of infection.

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