Ability • Adults • Aging • Antiviral • Choices • Completely • Decrease • Defense • Defenses • Effect • Equally • Exposure • From • Genetics • Getting • Have • Health • Immune • Immunological • Increase • Influence • Less • Level • Lifestyle • Likelihood • Makeup • Mask • Masks • Medications • Nutrition • Off • Particles • Predicted • Predicting • Predispose • Reduce • Related • Relationship • Resistance • Respiratory • Robust • Same • Smoking • Some • Susceptibility • Viral • Weakened • Weakening • Which • Yes