Preliminary study on the follow-up observations of the antibodies and circulating antigens in canine toxocariasis.

In the sera of dog fetuses and newborn puppies, no antibody to Toxocara canis was found but an elevation of the circulating toxocaral antigens (CTA). In the mother dogs, detectable IgG and IgM antibodies were found. The IgG antibodies gradually increased in the course of this observation. The most elevated levels of IgA antibodies were observed one month after birth. The same was true for the CTA levels. There was no placental transfer of the antibodies nor could they be transferred from the mother dog to the offspring via the colostrum.