The effectiveness of COVID-19 in protecting against severe illness during Delta:
https://www.cidrap.umn.edu/news-per...s-protect-against-severe-illness-during-delta
A trio of studies in Morbidity and Mortality Weekly Report (MMWR) today show that COVID vaccines protect very well against the Delta (B1617.2) variant, with unvaccinated people having 5 times the risk of infection and more than 10 times the risk of hospitalization or death compared with vaccinated people.
Researchers analyzed data that included the period of Delta variant dominance in the United States, and their results indicate that the Pfizer/BioNTech, Moderna, and Johnson & Johnson vaccines all show strong vaccine effectiveness (VE) against severe COVID-19.
Once Delta became the dominant strain, VE went from 91% to 78% against COVID-19 infection, 92% to 90% against hospitalization, and 94% to 91% against death. Those who were older, however, had higher hospitalization and death rates whether they were vaccinated or not, the researchers say.
Averaged weekly, age-standardized IRRs for cases among unvaccinated or partially vaccinated people decreased from 11.1 to 4.6 compared with those fully vaccinated, according to the data. In other words, the infection risk in a fully vaccinated person was one-fifth that of someone not vaccinated. IRRs for hospitalizations and deaths also declined, from 13.3 to 10.4 and 16.6 to 11.3, respectively.
The study authors note that unvaccinated people in the Delta-dominant era are more than 10 times likely to be hospitalized from COVID-19 or to die from it than vaccinated people are.
https://www.cidrap.umn.edu/news-per...s-protect-against-severe-illness-during-delta