“These findings indicate that while two-doses of mRNA COVID-19 vaccines are beneficial in immunocompromised individuals, they are significantly less protected from severe disease than people with normal immune systems,” said study lead author Peter Embí, M.D., M.S., Regenstrief Institute president and chief executive officer and associate dean for informatics and health services research at the Indiana University School of Medicine. “Since they are less protected after a two-dose series, those who are immunocompromised should receive an additional dose and a booster, take additional precautions like masking when in public, and, if they get infected, they should seek treatment with proven therapies that can protect against progression to severe disease and the need for hospitalization.”
The research team gathered data from more than 89,000 hospitalizations across nine states, making this the largest study of its kind evaluating COVID-19 vaccine effectiveness among immunocompromised people. Data analyses showed that mRNA vaccines (manufactured by Pfizer and Moderna) were 90 percent effective at protecting against COVID-related hospitalization in immunocompetent individuals, whereas they were only 77 percent effective in those with suppressed immunity due to a range of health conditions. The differences were similar across age groups. However, the effectiveness varied greatly among immunocompromised subgroups. For example, it was lower in organ or stem cell transplant patients and better in people with rheumatologic or inflammatory disorders.
The data came from the VISION Network, a collaboration between the CDC and seven organizations with integrated medical, laboratory, and vaccination records. The network was established to assess the effectiveness of COVID-19 vaccines. In addition to Regenstrief Institute, other members are Effectiveness of Two-Dose Vaccination with mRNA COVID-19 Vaccines Against COVID-19-Associated Hospitalizations Among Immunocompromised Adults — nine states, January–September 2021,” is published in the CDC’s Morbidity and Mortality Weekly Report.
Dr. Embí is the first author. Other authors from Regenstrief and IU are Shaun Grannis, M.D., M.S.; Brian Dixon, PhD, MPA; William F. Fadel, PhD and Nimish R. Valvi, DrPH.
Other authors on the paper are Matthew E. Levy, PhD, of Westat; Allison L. Naleway, PhD, of Kaiser Permanente Northwest; Palak Patel, MBBS, of the CDC COVID-19 Response Team; Manjusha Gaglani, MBBS, of Texas A&M University; Karthik Natarajan, PhD, of Columbia University and New York Presbyterian Hospital; Kristin Dascomb, M.D., PhD, of Intermountain Healthcare; Toan C. Ong, PhD, of University of Colorado; Nicola P. Klein, M.D., PhD, of Kaiser Permanente Northern California; I-Chia Liao, MPH, of Texas A&M University; Jungmi Han of Columbia University; Edward Stenehjem, M.D., of Intermountain Healthcare; Margaret M. Dunne, MSc, of Westat; Ned Lewis, MPH, of Kaiser Permanente Northern California; Stephanie A. Irving, MHS, of Kaiser Permanente Northwest; Suchitra Rao, MBBS, of University of Colorado; Charlene McEvoy, M.D., of HealthPartners Institute; Catherine H. Bozio, PhD, of the CDC COVID-19 Response Team; Kempapura Murthy, MBBS, of Texas A&M University; Nancy Grisel, MPP, of Intermountain Healthcare; Duck-Hye Yang, PhD, of Westat; Kristin Goddard, MPH, of Kaiser Permanente Northern California; Anupam B. Kharbanda, M.D., of Children’s Minnesota; Sue Reynolds, PhD, of the CDC COVID-19 Response Team; Chandni Raiyani, MPH, of Intermountain Healthcare; Julie Arndorfer, MPH, of Intermountain Healthcare; Elizabeth A. Rowley, DrPH, of Westate; Bruce Fireman, M.A., of Kaiser Permanente Northern California; Jill Ferdinands, PhD, of the CDC COVID-19 Response Team; Sarah W. Ball, ScD, of Westat; Ousseny Zerbo, PhD. Of Kaiser Permanente Northern California; Eric P. Griggs, MPH, of the CDC COVID-19 Response Team; Patrick K. Mitchell, ScD, of Westate; Rachael M. Porter, MPH, of the CDC COVID-19 Response Team; Salome A. Kiduko, MPH, of Westat; Lenee Blanton, MPH, of the CDC COVID-19 Response Team; Yan Zhuang, PhD of Westat; Andrea Steffens, MPH, of the CDC COVID-19 Response Team; Sarah E. Reese, PhD, of Westat; Natalie Olson, MPH, of the CDC COVID-19 Re
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