I was suspicious when you first posted this...I'm willing to bet they tried an antibiotic already that didn't work, but probably never went the whole lab-work route-
they had a good indication that it wouldn't be an easy-to-treat illness, & decided it was easier to give him away than to pay for the lab work, in case that still didn't
work for him. Good job coming to the rescue...Let's hope he gets well after all this.