Coleman JL, Hatch-McChesney A, Small SD, Allen JT, et al. Orally Ingested Probiotics, Prebiotics, and Synbiotics as Countermeasures for
Respiratory Tract Infections in Non-elderly Adults: A Systematic Review and
Meta-analysis. Adv Nutr 2022 Aug 10. pii: 6660647. doi: 10.1093.
PMID: 35948276