@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