I am with Glenntaj....they cultured for some types of bacteria.

Altho sprays and irrigations can help some stuff, if you have an infection it simply forces it upward and inward, to areas that you do not want infected with some hard to kill germ.

I would find out what they cultured for....did they check for opportunistic infections.

Did they check for Aspergillosis?

Also, it does take a while for the junk to come out, however, it should be getting better if you are on your second z-pack. Azithromycin otherwise known as zithromycin stays in your system for up to 30 days...the drug that keeps on killing....It is good stuff for most germ killing, where would we be without it....however,
you might want to check out side effects for floroquinalones. It is not PN friendly.

Keep a close eye on yourself.