evidence: Acid pH Increases SARS-CoV-2 Infection and the Risk of Death by COVID-19 - PMID: 34490283 - PMCID: PMC8417536 - DOI: 10.3389/fmed.2021.637885 Acid pH Increases SARS-CoV-2 Infection and the Risk of Death by COVID-19 [...] Keywords: Barrett's esophagus; COVID-19; SARS-CoV-2; pH; proton pump inhibitors.