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Toxocariasis is a helminthic zoonosis caused by larval stages of the roundworm of dog, Toxocara canis , and less frequently by T. cati , the roundworm of cats. Eosinophilia in peripheral blood may be indicative of a disease; however, it does not necessarily represent toxocariasis. Therefore, it is necessary to investigate the relationship between eosinophilia and toxocariasis in a region. The aims of this study were the diagnosis of hyperosinophilia patients using traditional ELISA kit and also by a handmade ELISA kit produced by T. canis excretory-secretory (TCES) antigens as well as the determination of the abundance of anti- Toxocara antibodies among people referred to Urmia, northwest of Iran care centers. Traditional ELISA kit was used to determine anti-TCES-specific IgG antibodies on 180 hypereosinophilic samples. These antibodies were evaluated in 1002 samples, including 180 hypereosinophilic samples and 822 random samples without eosinophilia by a handmade ELISA kit produced by TCES antigens. A Western-blot confirmatory test was performed on ELISA-positive samples. Our results showed a 17.22% prevalence rate of Toxocara antibodies among hypereosinophilic samples with traditional ELISA kit, and this rate was 3.89% in the 1002 study population with random sampling (with or without eosinophilia). Also, there was a good match between the results of handmade ELISA with those of traditional kit. The positive results in the ELISA method were confirmed by the Western-blot analysis. Our findings show that although the high eosinophil count is not necessarily a sign of toxocariasis, in Urmia distric, about one-fifth of eosinophilia cases have anti-toxocariasis antibodies. In addition, the abundance of anti-Toxocara antibodies in this area was 3.89%.

journal of parasitic diseases

Designing and standardizing Toxocara serologic diagnostic kit and determining anti-Toxocara antibodies frequency in patients referred to health care centers in Urmia (northwest of Iran)