Are COVID-19 Vaccines Effective Against the Delta Variant?

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Are COVID-19 Vaccines Effective Against the Delta Variant? According to data from a national study, vaccines are effective at preventing hospitalizations and emergency medical visits related to COVID-19. The same study also shows that Moderna's vaccine is the most effective, significantly reducing hospitalizations even in the presence of the new COVID-19 variant. Vaccines are strongly recommended to everyone eligible to reduce serious illness and ease the burden on our healthcare system. The data, provided by the Centers for Disease Control and Prevention (CDC)'s VISION Network, included more than 32,000 medical encounters from nine states during June, July, and August 2021. During this time, when the variant became the predominant strain, the study showed that vaccinated people are 5-7 times less likely to need emergency department care or hospitalization. This overall effect is similar to before the variant. In the study, the vaccines were effective at preventing hospitalizations in adults 18 and older as follows:

  • Moderna was 95 percent effective
  • Pfizer was 80 percent effective
  • Johnson and Johnson was 60 percent effective
Vaccine effectiveness is also lower for people ages 75 or older according to the study, which previous research did not show. This could be due to the increased time since vaccination. In preventing emergency department and urgent care visits, analysis showed that:
  • Moderna was 92 pecrent effective
  • Pfizer was 77 percent effective
  • Johnson and Johnson was 65 percent effective
According to scientists, these findings need further monitoring and evaluation. Dr. Grannis, with the study, says that "vaccines continue to offer much more protection" than not getting one. Data shows that "symptoms are less severe" in vaccinated individuals, according to Grannis. COVID-19 vaccines are powerful tools for combating a pandemic that has devastated and continues to devastate many communities. Funded by the CDC, the VISION network includes seven organizations that contribute to and analyze data from U.S. healthcare systems to study COVID-19 vaccine effectiveness. In addition to Regenstrief Institute, other members of the network are Columbia University Irving Medical Center, HealthPartners, Intermountain Healthcare, Kaiser Permanente Northern California, Kaiser Permanente Northwest, and the University of Colorado.


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