Listen I'm going to tell you I worked in London in the 80s and pulled down old ceilings full off filth for the best part of 17 years without a mask!! I'm still here and puffing on a cig as I speak!! Stop going mad!! I've had flu just after Xmas and yesterday got a scratchy throat and cough!! Thought oh s**t I'm infected!! But today got up, and still felt rough but no worse. I've been taking origano oil tabs of eBay, but the thing I thing has had the most effect is the serrapeptise I've taken.. Full strength 250000 ones. I've taken double the dose so far and feel great!! Just sharing my experiences.