[Margaret Pilkington]

John, this infection is extremely common......it can be present on the skin(even your own)......and is present in soil......it is an opportunistic organism, that means, when the good bacteria(the ones that live with you and cause you no harm at all) are killed off by antibiotic therapy(multiple antibiotic therapy in your case) these little blighters move in and occupy the places that have been vacated by your now dead 'good bacteria'.

I hope the planned treatment works and that they do not have to resort to plan B.