Yes, this is a constantly evolving learning process. As for the MAC, yes, normal lungs clear mucus well, but ours do not. So the purpose of 7% saline & airway clearance are twofold. The saline helps thin the mucus, allowing us to cough it out, and provides an inhospitable environment for the bacteria in the mucus that is left behind. A while back, I had an "Aha!" moment, when I left my nebulizer behind on a 3 day trip - but when I coughed hard on the 3rd day, the mucus that came out actually tasted salty in my mouth - so the residual saline that was hiding in my lungs doing its job.

We have 3 & 6 year old grandkids and their Mom is a nurse, so is super diligent about keeping us safe. We have had times when we helped out - fully masked, as were they, and have managed to stay healthy in spite of their childhood viruses.

We are also fortunate to winter in the far south, so even manage to entertain outdoors most of the time (but not this week - 50F & North winds are not patio weather).

Stay healthy!
Sue