I have had very very good results with a homeopathic formula by Hobon in Naples Fla called Fungi Yeast. Also order R&R and Supportasode. It is a licensed line so your vet may have to call.

Have also had very good luck with Supportasode, R&R & Viratox for feline leukemia & Fip when given along with Lifeguard by Starlight Int.

Viratox will negate active immunity if given within 21 days of a vaccine however so if rabies is a concern in your area and you treat with Viratox within 21 days of giving vaccine you should revaccinate.