Ping.
"Some researchers have blamed modern dust-free homes...."
This is not a problem I have in my house.
Why is asthma so prevalent among the otherwise healthy and affluent populations of the US--and also so prevalent among the least healthy and most impoverished populations in other countries?
Follow the money--and grant$ to research foundations, before you take this sort of thing too seriously.
Check any product in your house that says "anti bacterial" and you will read prescription antibiotics in the list of ingredients. Most common products are soaps and sprays.
Bump for later read.