I'll add my echoing voice to those who have recommended interferon and
ImmunoRegulin ASAP. Our kitten Loopy was very ill over Thanksgiving (shortly
after she was diagnosed). She had a high fever, was dehydrated and had a
neutrophil (wbc) count of "0". We immediately started her on interferon and
about a week later on ImmunoRegulin. We gave her subQ fluids and fed her
Science Diet A/D and Wysong. She quickly made a remarkable recovery.
For the low neutrophil count, we have been using the Neupogen Barb mentioned.
The vet can write you a perscription for it. It's a little expensive, but well
worth it. It has worked wonders.
Good luck.
-Matt