Thanks Terri @windwalker. The smoky air has been less choking for the past few days but down here it's late spring -- it's going to be a long hot summer. (Australia is around the same size as the USA minus Alaska. Three quarters of the country have been in the worst drought ever and wildfires have been wiping out millions of acres around the country).
Anyway, when I finally finish these TB meds, I hope I can find a doctor to put me on a good prophylactic treatment something like yours. Thanks so much for telling us about it. All the best, Annie