Does anyone have any experience of this happening to their cat? My cat has been at my vets for 4 days now. As his blood tests showed that he had very low red and white blood cell counts they tested some of his bone marrow. Thankfully it came back clear for leukaemia. My vet thinks a virus caused his bone marrow to stop funtioning properly. I was wondering if anyone else has had any experience of this, if their cat got better and how long did it take?