NASAL HYGIENE COMPOSITIONS, ANTIMICROBIAL TREATMENTS, DEVICES, AND ARTICLES FOR DELIVERY OF SAME TO THE NOSE, TRACHEA AND MAIN BRONCHI

Salt-based non-therapeutic hygienic formulations or compositions or therapeutic formulations or compositions, for example those rich in calcium, are effective against airborne pathogens, suppressing virus shedding, for instance by increasing a surface viscoelasticity of airway lining fluid. Associated apparatus, methods and articles are used to deliver salt-based non-therapeutic hygienic formulations or compositions as hygienic treatments to the upper respiratory tract. Associated apparatus, methods and articles are used to deliver salt-based therapeutic antimicrobial formulations or compositions to the upper respiratory tract. For example, nasal delivery of calcium-rich salines with aerosol droplet size of around 10 μm (e.g., 7 μm-15 μm, or more preferably 9 μm-10 μm) may advantageously limit distribution to the nose and upper airways of the respiratory tract, suppressing bioaerosol generation. A nebulizer may deliver the aerosol into free space, or into a partially enclosed volume, and the composition naturally inspired by one or more subjects.