That is a very good question. I cannot seem to get a straight answer on that. I have mucoid strain and based on that my Pulmo said I will never get rid of the Pseudo. I am his only non CF patient with mucoid strain. I guess mucoid strain is common with CF? Considered the hardest to deal with. The biofilm is more? But then non mucoid strains seem to also be chronic as people report getting PA "over and over". I think it just retreats and comes back mucoid or not!