"Heartworm antibody" refers to a type of protein produced by a dog's immune system in response to heartworm infection. This protein helps the body recognize and fight against the heartworm parasite. Full definition
Myth # 4: A negative heartworm antibody test rules out heartworm disease in cats. (tampabayvets.net)
Fifteen percent tested positive for heartworm antibodies.1 (Levy 2003) Another study found that many shelters based their feline heartworm policies ``... on inaccurate knowledge of feline heartworm prevalence...» 2 (Dunn 2011) (zoetisus.com)
Cats testing negative for heartworm antigen may benefit from other diagnostic tests, including heartworm antibody assays. (zoetisus.com)