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Good to hear from you again. I am glad to hear that Marmalade's Elisa was negative.
Have any other blood tests been done on him: chemistries to check liver and kidney function, blood sugar, electrolytes, etc.? He could have an illness unrelated to feline leukemia.
My understanding is that an IFA test is the best way to rule out that a cat is infected and sick because of the virus.
No, the ELISA is not at all the same as IFA. ELISA tests for the presence of virus in the blood viremia. Many cats will be transiently viremic, but never get infected. IFA tests for a marker that shows that the blood cells have been infected and transformed by the virus, and are now producing viral DNA. These cats are infected, and will sicken and eventually die.
Yes, I did look at the reports and saw the PCR tests and amount of proviral. That does not tell me why Marmalade is losing weight and not eating well. It could be related to feline leukemia infection, or it could be something else. I would need to see his "CBC and chemistry" results. It says in the first report that these are "to follow", so these tests were done. Do you have the results of those tests?
OK now I see the white blood counts and they are low. This could be related to feline leukemia, another viral disease, or bone marrow disease. Further viral testing and possibly a bone marrow biopsy might tell us more about this. He is not anemic, his red cell counts are good.
There are a few blood chemistries, showing that his kidney function may be reduced (high urea, high phosphate). I would do a urinalysis to learn more about his kidney function.
The only way to increase the cells, is to find out why they are low. That might involve testing for other viruses, or even a bone marrow biopsy.
Antibiotics treat bacterial infections, not viral. Bacterial infections usually cause high white blood cell counts, not low. You could try the Convenia, but I am not sure it will help.
There are a very few anti viral drugs, that are specific for particular viruses, but no broad spectrum anti viral drugs like we have antibiotics.