FIV is transmitted thru biting, not scratching, if that helps. And, honestly, I've never heard of needing to do a bone marrow aspirate to check for it. There are TWO different tests, but neither is that. They are both done with blood smears and if they come back negative, that is usually good, as far as I've heard. WAs he vaccinated for this? If so, it IS harder to test for, as he would have the antibodies in his system. Maybe this article will be helpful: http://www.vet.cornell.edu/fhc/health_information/CW_FeLV.cfm
Not sure that simply waiting a month for another CBC is really going to tell you anything, since Petey's numbers seem to fluctuate like the tide.
Is your Vet a feline only Vet? If not, do you have access to one? I'm thinking that may be your best bet...try to find someone who specializes in felines. They are better versed in all things cats and may have some idea of what might be wrong. (still wonder WHY it couldn't be that hemobartonellosis you mentioned way above
)
Not sure that simply waiting a month for another CBC is really going to tell you anything, since Petey's numbers seem to fluctuate like the tide.
Is your Vet a feline only Vet? If not, do you have access to one? I'm thinking that may be your best bet...try to find someone who specializes in felines. They are better versed in all things cats and may have some idea of what might be wrong. (still wonder WHY it couldn't be that hemobartonellosis you mentioned way above