Cat dying with virus

My 4 indian cats died in a week. I tried my best day and night to bring to vet but none of them survived. They were not vaccinated. Doctor said they got infected with leukopenia. 4th cat died today. Since kast week our family nmembers are extremely sad and worried and stressed. None of us are able to understand that we lost our 4 cats in a week. God please develop some medicine for this virus, just like we developed for covid in few months. Symptoms: Stopped eating, high fever, a discharge from nose and mouth those who were admitted in hospital and were on medication, watching water bowl but not drinking, a little bit smell from body

I'm so sorry to hear that you have had such a difficult and painful experience.  Losing a single cat can be hard, but this sounds horrific.  I'm not sure whether you aware of the RALPH site (www.theralphsite.com), but they are dedicated to caring for owners after the loss of a cat (or cats) and it may help a lot to reach out to them at this time.