The video lacks context. It compares comments made by Walensky prior to the rise of the Delta variant, which was first designated a variant of concern (VOC) in May 2021 by the World Health Organization (WHO), to her comments at a press briefing in August, with Delta the current dominant strain in the United States (
here).
“The issue is that COVID-19 is not the same disease as it was 6 months ago. The delta variant is more contagious and requires higher levels of antibodies for killing it. Therefore, these videos tell only half the story,” Dr Buddy Creech, Associate Professor of Pediatrics, Division of Pediatric Infectious Diseases, at the Vanderbilt University School of Medicine in Nashville, Tennessee, told Reuters via email when presented with the claims.
On April 2, a CDC study found that the mRNA vaccines were highly effective in preventing symptomatic infection in randomized placebo-controlled Phase III trials (here).
CDC data shows a significant reduction in hospitalizations and deaths due to COVID-19 following the rollout of vaccines at the start of the year (here).
However, with the rise of the significantly more transmissible Delta variant, early findings have suggested that vaccinated people can still transmit the virus (
here), (
here), (
here).
Speaking at the August 18 press briefing, Walensky said that although vaccines are currently working well to prevent hospitalizations, there is “concerning evidence” of “waning vaccine effectiveness over time and against the Delta variant,” and confirmed that booster vaccines will be rolled out to Americans next month.
Still waiting for your source????