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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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