Study registration: *
Publication Grannis S, MMWR, 2021
Dates: 2021-01-01 to 2021-08-04
Funding: Mixed (VISION network is funded by CDC and includes Columbia University Irving Medical Center (New York), HealthPartners (Minnesota and Wisconsin), Intermountain Healthcare (Utah), Kaiser Permanente Northern California (California), Kaiser Permanente Northwest (Oregon and Washington), Regenstrief Institute (Indiana), and University of Colorado (Colorado).)
Conflict of interest: NR
Description of participants: Adults hospitalized with COVID-19-like illness in 9 states in multiple centres in USA
Follow-up duration (months): 7.17
|Variant description :
Variant name: Delta|
Evidence: Indirect evidence (prevalence of variant in the population: >50%)
The published report was used in data extraction and risk of bias assessment.
Some concerns over the possibility of uncontrolled confounding given the observational nature of the data, on outcome ascertainement being influenced by knowledge of vaccination status and on pre-specified plan not being available.