I've been thru that worry - my mom's cat tested antibody positive/antigen negative, and went to see the cardiologist for an ultrasound, which was negative. The comment made was "well, he's had them and gotten rid of them, they're sitting in the lungs where we can't see them, he's been exposed and may yet get them or not. Put him on preventative, and retest him in 6 to 12 months." The cats have been on preventative since then, and have tested negative.
no subject
I've been thru that worry - my mom's cat tested antibody positive/antigen negative, and went to see the cardiologist for an ultrasound, which was negative. The comment made was "well, he's had them and gotten rid of them, they're sitting in the lungs where we can't see them, he's been exposed and may yet get them or not. Put him on preventative, and retest him in 6 to 12 months." The cats have been on preventative since then, and have tested negative.