It can be confusing.  Hopefully this chart will help
The IFA test will not show up as positive until the virus has moved to the bone 
marrow.  I have no idea what a slight positive means.  Wish vets wouldn't use 
that.  Can you do the ELISA again in 60-90 days?

 From: I-Chun C. C. Chang <>
Sent: Saturday, May 11, 2013 3:39 AM
Subject: [Felvtalk] inconsistent results from the snap and IFA tests

Dear friends, 

We earlier did a snap ELISA test for my 16 yrs old indoor late stage CKD girl, 
Meowko, which was positive. But We just got her confirmatory IFA test back on 
Thursday, which is negative. In 
order to confirm whether the first snap test was false positive, we did the 
snap test again. The result was still positive (although we were told that it 
"slightly" positive, I am not sure what this means...I guess it is like 
pregnancy test's faint line? ) Before all these tests, Meowko was tested twice 
negative when we adopted her and received vaccines.  

I was wondering if anyone on this list has experience with contradictory 
results on snap and IFA tests? or if you have any thoughts on what we can read 
out of these tests? Can the contradictory results provide any clues for 
Meowko's current virus infection situation and therefore treatment 

Any thoughts and advice are appreciated. Thank you very much. 

with my best, 

Catherine  (& Meowko)

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