The Food and Drug Administration said vaccines cleared in the U.S. currently provide sufficient protection against severe disease and death from Covid-19 without additional doses, potentially complicating the Biden administration’s deliberations over the need for booster shots.
The FDA released the findings in a report analyzing data submitted by Pfizer Inc. and BioNTech SE as part of their request for authorization for their vaccine to be given as a booster shot in people 16 years and older.
Association between COVID-19 outcomes and mask mandates, adherence, and attitudes
Using an event study design, authors estimate the treatment effect of the introduction of mask mandates (shown on the vertical red line) on Z-scored population-normalized COVID-19 daily new confirmed cases, daily new hospitalization admissions proportion, and deaths across all 50 states and D.C. over the time period between February 1 and September 27, 2020.
Source: Dhaval Adjodah, Karthik Dinakar, Matteo Chinazzi, Samuel P. Fraiberger, Alex Pentland, Samantha Bates, Kyle Staller, Alex Vespignani, Deepak L. Bhatt. Association between COVID-19 Outcomes and Mask Mandates, Adherence, and Attitudes.