New data from an ongoing University of Arizona Health Sciences research study show that the COVID-19 vaccines remain effective following the predominance of the delta variant, although at a lower rate than prior to its emergence. The newly released findings from the longitudinal Arizona Healthcare, Emergency Response, and Other Essential Workers Surveillance (AZ HEROES) research study at the Mel and Enid Zuckerman College of Public Health point to a need for more vaccinations to offset the decline in effectiveness. With lower vaccine effectiveness following the emergence of the delta variant, individuals in the study who were vaccinated had a two-thirds reduction in risk of infection compared with unvaccinated individuals.
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