Study registration: *
Publication Cohn B, medRxiv, 2021
Dates: 2020-12-31 to 2021-07-31
Funding: Public/non profit (Mercatus Center at George Mason University and University of California Office of the President.)
Conflict of interest: Yes (CCM reports consulting for Freenome. AWW reports consulting for ECOM Medical, Obelab, Sensifree, and Shifamed. BAC, PMC, and NYK declare that they have no competing interests.)
Description of participants: Adults aged 18 and older including elderly and co-morbidities in all states and territories of USA
Follow-up duration (months): 7.00
|Variant description :
Variant name: Delta|
Evidence: Indirect evidence (prevalence of variant in the population: 1 to 99%)
The preprint was used in data extraction and risk of bias assessment. Infection results are presented for the subgroup tested in July 2021.
Concerns over uncontrolled confounding and potential for selection bias due to restriction of the analysis sample to those who received a PCR test during the vaccinated or unvaccinated follow up time.