research Mucosal TLR5 Activation Controls Healthspan and Longevity 1 citations, January 2024 in “Nature communications” Activating TLR5 in the gut can extend lifespan and improve health in aged mice.
research From Bedside to Bench: Regulation of Host Factors in SARS-CoV-2 Infection 4 citations, April 2021 in “Experimental and Molecular Medicine” The conclusion is that certain genetic factors and blood types may affect COVID-19 severity, but changes in ACE2 and TMPRSS2 genes are not clearly linked to it.