coronavirus(5) Infection(5) Result(5) objective(5) Feline infectious peritonitis(5) quantitative PCR(4) virus(4) performed(4) Transmission(4) transcriptase(4) Feline coronavirus(4) positive(3) Blood(3) FIP(3) RT-PCR(3) investigated(3) Probability(3) association(3) immunohistochemistry(3) serum(3) Bentonite(2) serum samples(2) tom cat reproduction(2) tested(2) Coronavirus infection(2) was performed(2) less(2) Cell culture(2) incubated(2) contagious(2)