The Centers for Disease Control and Prevention updated its guidance on Thursday on the administration of the two coronavirus vaccines currently approved for Emergency Use Authorization.
The guidance clarifies several questions public health practitioners have recently asked. Can the two doses of the Pfizer and Moderna vaccines be split, and how long do patients have to get the second dose of the vaccine?
Both doses of the vaccine require patients to return for a booster. For the Pfizer vaccine, the second dose is recommended three weeks after the first dose. The second dose of the Moderna vaccine is due four weeks later.
The CDC said that it continues to recommend that the same type of vaccine be administered to patients. But if only the opposite type of vaccine is available, the CDC said that the other vaccine can be administered and is considered effective.
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.