Wow! I've often believed this! That would be so wonderful to do a study of teachers and MAC. I too was sick every winter and then some. Pneumonia, walking pneumonia, bronchitis, etc. I loved my schools, the students, parents, etc. but classrooms were literally rotting before us each day. The smell was incredible to someone who has a strong sense of smell. I now think I could almost smell the MAC, if I'd known what it was. I spent weekends sneaking over to clean and paint and coat things that weren't done by the custodians. We were not allowed to do this of course, but otherwise the children and myself lived in further poor conditions. Bless you for the work you did. Best to you.