I said:
 
"I would perform the ELISA first--if it's negative, the infection was likely transient and Pilgrim is probably fine. If it's positive, then retest on the IFA. If that is still negative, then you should probably treat it as discordant and assume that the cat is POSITIVE because he may be able to give the disease to other cats and may become actively symptomatic down the line. I think his prognosis is generally better, however."
 
But I just realized that that isn't the best approach. If you do the IFA first and it's positive, it will save you the cost of the second ELISA. If it's negative, then you do the second ELISA and go from there. Please pardon my error.
 
Melissa in NJ

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