A. FCV titers can be quite confusing and their significance is sometimes difficult to decipher. A positive titer simply means at some point your kitten was exposed to and developed antibodies to FCV. If your kitten is asymptomatic (no diarrhea, lethargy, loss of appetite), then there should be no cause for concern.
A. What it means is that your kitten was exposed to FCV at some point. Some cats that have a positive FCV titer go on to develop Feline Infectious Peritonitis, but the density of the cat population is a strong factor, that's why purebred cats from breeders or catteries tend to have a higher incidence of FIP. FCV titers are difficult to interpret and understand. The results are of an antibody titer. Your immune system develops antibodies to viruses. The titer measures how much of an antibody response has been generated, which in some cases can be an indication of disease.
A. It is not unusual, but it is concerning. The blood test cannot determine the type of Coronavirus but we do know that strains of coronavirus cause Feline infectious peritonitis. You can read more about it here: http://www.petmd.com/cat/conditions/infectious-parasitic/c_ct_feline_infectious_peritonitis
I would highly recommend watching your kitten for any of the symptoms of FIP. Make sure to keep him/her quarantined from any other cats until your veterinarian can recommend how to proceed.
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