HI My 2 month old niece was taken to the doctor due to high fever. Doctor suspected UTI so she tried to administer catheter, 3 times at clinic. Had to be sent to ER and they administered catheter there. Now results are in and they are saying a UTI with E Coli. Wondering how my niece obtained this infection. Reading online it looks like not washing hands is leading cause. Since we are all very good at hand washing I'm wondering if it's possible to contract Ecoli via respiratory tract sine there were new puppies in the house? Niece is still in hospital and now they are saying she will need to start a 10 day course of antibiotics.