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Master of Public Health

Effectiveness of mRNA vaccines in preventing COVID-19 hospitalization by age and burden of chronic medical conditions among immunocompetent US adults, March-August 2021

AUTHORS

Lewis NM , Naioti EA , Self WH , Ginde AA , Douin DJ , Talbot HK , Casey JD , Mohr NM , Zepeski A , Gaglani M , Ghamande SA , McNeal TA , Shapiro NI , Gibbs KW , Files DC , Hager DN , Shehu A , Prekker ME , Erickson HL , Gong MN , Mohamed A , Henning DJ , Steingrub JS , Peltan ID , Brown SM , Martin ET , Hubel K , Hough CL , Busse LW , Ten Lohuis CC , Duggal A , Wilson JG , Gordon AJ , Qadir N , Chang SY , Mallow C , Rivas C , Babcock HM , Kwon JH , Exline MC , Halasa N , Chappell JD , Lauring AS , Grijalva CG , Rice TW , Rhoads JP , Stubblefield WB , Baughman A , Womack KN , Lindsell CJ , Hart KW , Zhu Y , Schrag SJ , Kobayashi M , Verani JR , Patel MM , Tenforde MW , . The Journal of infectious diseases. 2021 12 21; ().

ABSTRACT

In a multi-state network, vaccine effectiveness (VE) against COVID-19 hospitalizations was evaluated among immunocompetent adults (≥18-years) during March-August 2021 using a case-control design. Among 1669 hospitalized COVID-19 cases (11% fully vaccinated) and 1950 RT-PCR-negative controls (54% fully vaccinated), VE was higher at 96% (95% CI: 93-98%) among patients with no chronic medical conditions than patients with ≥3 categories of conditions (83% [95% CI: 76-88%]). VE was similar between those aged 18-64 years vs ≥65 years (p>0.05). Vaccine effectiveness against severe COVID-19 was very high among adults without chronic conditions and lessened with increasing burden of comorbidities.

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