Probiotic improves symptomatic and viral clearance in Covid19 outpatients: a randomized, quadruple-blinded, placebo-controlled trial
Gutiérrez-Castrellón et al., Gut Microbes, doi:10.1080/19490976.2021.2018899 (preprint 5/24/2021)
https://c19early.org/gutierrezcastrellon.html