Dear Gary
I have used Staphoccocal Protein-A, from Sigma Aldrich:
Product: P6031 - 1MG, Protein A from Staphylococcus aureus; Soluble, 
essentially salt-free, lyophilized powder;  or Product: P3838 - 1MG, Protein A 
from Staphylococcus aureus; Soluble, Cowan Strain, essentially salt-free, 
lyophilized powder.


It is important to note that transgenic Protein A expressed in Escherichia 
colli, although having the same immunoglobulin binding properties, does not 
have the same superantigenic properties as the native one. The difference may 
be due to a bit of contamination with other superantigens from Staphlococcus 
aureus (perhaps with staph entherotoxin-A during product extraction and 
purification). So the transgenic version does not serve to our intent.

This product is currently used as a chemical reagent, and not as a medication 
(except in experimental studies). You have to register before buying and 
affiliation to some university or research institute is wanted (maybe you can 
get an aid from another person).

Although I am a researcher, I was not made any experiment with my FelV+ cats, 
so I cannot be sure if apparently hopeful outcomes were not merely by chance. I 
just think the subject merits more attention, considering the earlier 
surprising results obtained by scientists.  I am also aware of a subsequent 
statistically controlled study carried on by Vet-researchers found no 
significant difference from the placebo group. But I am also aware that unknown 
variables, then unsuspected (such a little bit of contamination mentioned 
above, certainly a trait neither standard nor regularly desired by the 
fabricants), can account for different results obtained by different 
researchers in different circumstances.

By the way, tree of my four FelV+ cats have already gone (crossed the bridge as 
you say), Pupa and Mãe victims of lymphoma, and Porchops due an idiopathic 
cystitis (apparently not felv-related).  All the four got considerable 
improvement in most blood counts during and after treatment and never suffered 
from FelV-related opportunistic infections. Jorge, the one that remains in this 
world, is doing very fine, thanks, being asymptomatic up to now.  Early 
experiments using protein A have reported that 28% of the cats respond 
positively to the treatment. I think the attempt was not deceiving yet.


Best wishes for you all.


> From:
> To:
> Date: Fri, 7 Aug 2009 16:17:53 -0500
> Subject: [Felvtalk] Staph Protein A
> Has anyone on the list ever used Staph Protein A for treatment of FeLV cats?
> If so, where did you get it? I just talked with two of the manufacturers
> that are listed on the site and both said they could not
> sell it except to a research facility. They said if a vet wanted it, he
> would have to be doing a research study and his application for it would be
> reviewed by the company to see if they though he met their criteria. They
> would not sell it simply for treatment use.
> I will keep looking, but it seems a shame that something with all the
> promise of Staph Protein A (and a LOT cheaper than LTCI) can't be purchased
> to save kitties.
> Gary
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