"Circulating antibodies" refer to proteins in our blood that help our immune system recognize and fight off harmful invaders like bacteria, viruses, or other foreign substances." Full definition
A dog with circulating antibodies may still come down with the diseases, depending upon his diet, immune system, and stress status. (dogsnaturallymagazine.com)
Puppies born to dogs that were vaccinated just prior to mating usually have high levels of circulating antibodies so that they do best when their first vaccine is closer to 12 weeks of age. (1800petmeds.com)
The ELISA test is considered not as accurate because many dogs without atopy are tested positive, which may happen when the dog has been exposed to the allergen and has developed circulating antibodies against it. (natural-dog-health-remedies.com)