People Who Received Older Pfizer COVID Vaccines Had Similar Outcomes as Unvaccinated: Study

People who received any version of Pfizer’s COVID-19 vaccine except for the newest one were no better off than the unvaccinated, according to a new paper. “Compared to the unvaccinated, those who had received only older versions of COVID-19 vaccines did not show significantly reduced risk of COVID-19 outcomes, including hospital admission,” Sara Tartof of Kaiser Permanente and her co-authors wrote. Analyzing recent data from the Kaiser Permanente Southern California, Ms. Tartof and colleagues found that people who received at least two doses of older vaccines actually had a higher risk of outpatient visits and, for some age groups, were more likely to be hospitalized with acute respiratory illness....