Pseudomonas Fluorescens?

My 12 month old son just tested positive for Pseudomonas Fluorescens and I'm just very confused with what it means exactly. His doctor explained to me that he would start on Tobi and that it's not to be taken lightly. I am so scared and confused and was just hoping to hear from someone that can tell me about it and what it means for my son..
Source: Cystic Fibrosis Newly Diagnosed Forum - Category: Respiratory Medicine Authors: Tags: Newly Diagnosed Source Type: forums