Gregory's Server@currentbias That's a good point - I wonder how effective a nasal spray would be for people constantly dining out or partying like it's 2019. I imagine people breathing through their mouths while eating, drinking, and socializing would defeat the purpose of a nasal spray, too.
@BioGeek23 @currentbias Agree. Have no relevant specialist background, but have never thought nasal sprays alone would be a good defense because some inhaled air will bypass sprayed areas. Also, am aware nasal sprays may have risks. Micro-organisms can reach the brain (e.g. causing meningitis) from the nose and throat. Maybe paranoid, but people losing eyes/sight from contaminated eye drops makes me wary about using nasal sprays. Respirator = physical barrier = better IMHO