Dogs already have their own coronavirus vaccine. I’ll bet immunized dogs would test positive for other coronaviruses.
Indeed.
If testing for antibodies, eveey dog will teat positive, either as vaccinates, or just as likely, from getting the virus and recovering from it via antibody titers.
We don't even vaccinate dogs for the corona any more, we let them become exposed and recover after a few days of diarrhea.,P>Immunity is lifelong.
I don't now if extrapolation into the human disease is a fair assessment, but the point stands. Any recovered patient will have a positive titer of antibody.
If they are testing the actual antigen, the actual virus, this would be a more accurate assessment of infection, but the patient has to become viremic before a positive blood test, and that depends on the incubation period.