I'm sending many purring special needs kitty songs to Almalfi that he can pull out of this. FIP is such a terribly hard diagnosis to even attempt diagnosing. It bothers me terribly that so many vets go by the random test which only determines if a 'corona virus' is present, but how can they tell a common kitty cold, from FIP? There are literally hundreds of corona viruses, and experts say over 75% of cats that are over a year old, have a corona virus in their system. There is a newly developed test involving the paws, but I haven't read the latest article due to lack of a moment to absorb it. Have you considered Zithromax to clear his lungs? One half a 250MG tab one dose. I have used tiny chips and saved small kittens lives when pneumonia hit here several years back, and the very next day the kitten gasping for breath, was bouncing off the walls. To be on the safe side, I redosed a week later, and all seven kits, and mom went off to new homes. I'm really hoping your gorgeous boy can overcome this.