As you said no test is 100% accurate, the IFA is the better test.
The hard part, is your almost certainly not going to know when
a cat was exposed so the accuracy of the test is always going to be
questionable. A cat that tests positive may still be in the stage of
trying to fight the virus off and may very well test negative at a
later date. The way I look at it is that a healthy, vaccinated
negative cat is very unlikely to get the virus from a positive, and
if they did their own healthy immune system would most likely
successfully fight it off. Not to say it couldn't happen, but I
personally believe the chances are almost zero.
--
Belinda
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