Was the kitten vaccinated for FeCoV then? Other vaccinations (such as the standard FVRCP) would not affect the FeCoV titer result. It's not a normal vaccine to give, as it has not been proven to be very useful at all.
I'd imagine as Patti says, that if the last kitten from this cattery died of FIP then Coronavirus is in that cattery and your kitten was also exposed. That's a relatively significant result, was it the Idexx test that means the titer is a minimum of 1:1600 or was that the more specific result from Cornell University? If it was Idexx or Antech the actual titer might well be higher...so you might want to quarantine and retest to make sure the titer is decreasing before introducing to your other cat.
I'd imagine as Patti says, that if the last kitten from this cattery died of FIP then Coronavirus is in that cattery and your kitten was also exposed. That's a relatively significant result, was it the Idexx test that means the titer is a minimum of 1:1600 or was that the more specific result from Cornell University? If it was Idexx or Antech the actual titer might well be higher...so you might want to quarantine and retest to make sure the titer is decreasing before introducing to your other cat.