How Do I Know When I Need to Wear a Mask?
Respiratory infectious disease epidemiology
When should I wear a mask?
Does anyone around me have a chronic health condition, or are over 65 years old?
Be more careful to wear a mask.
Has everyone around me already been infected with COVID-19, or were they vaccinated at least 3 weeks ago?
Still practice caution, you can be reinfected with COVID-19.