Seroepidemiological study for toxocariasis among children in Zanjan-northwest of Iran.

Determination of seroepidemiological survey of Toxocara infection in 810 sera from children inhabitants in rural and urban area of Zanjan (North-West of Iran) was adjusted for specific antibody level against of second stage larvae of Toxocara for excretory and secretory antigens based on ELISA technique. In contrast of the other studies, the overall seroprevalence was quite low, reaching to 2.7% out of 810 samples was positive to anti Toxocara species antibodies. Neither age nor gender seemed to be significant factor to positive serology. Seroprevalence of anti Toxocara antibody were detected in 8 out of 494 (1.6%) children from urban area, whereas 316 sample (4.4%) were the positive in the rural area. Positive children who had contact or ownership of cats and dog were 6.9 and 3.9%, respectively. Albeit, concerning to this study, seroprevalence of toxocariosis is lower than other countries and other studies in Iran. But protections of toxocariosis in children must be taking into account in public health program. Suggest that increase of hygiene education would be a crucial affective on population to reduce infection risk factor and zoonotic disease.

Immune response to dietary proteins, gliadin and cerebellar peptides in children with autism.

The mechanisms behind autoimmune reaction to nervous system antigens in autism are not understood. We assessed the reactivity of sera from 50 autism patients and 50 healthy controls to specific peptides from gliadin and the cerebellum. A significant percentage of autism patients showed elevations in antibodies against gliadin and cerebellar peptides simultaneously. For examining cross-reaction between dietary proteins and cerebellar antigens, antibodies were prepared in rabbits, and binding of rabbit anti-gliadin, anti-cerebellar peptides, anti-MBP, anti-milk, anti-egg, anti-soy and anti-corn to either gliadin- or cerebellar-antigen-coated wells was measured. In comparison to anti-gliadin peptide binding to gliadin peptide at 100%, the reaction of anti-cerebellar peptide to gliadin peptide was 22%, whereas the binding of anti-myelin basic protein (MBP), anti-milk, anti-egg and anti-soy to gliadin was less than 10%. Further examination of rabbit anti-gliadin (EQVPLVQQ) and anti-cerebellar (EDVPLLED) 8 amino acid (AA) peptides with human serum albumin (HSA) and an unrelated peptide showed no binding, but the reaction of these antibodies with both the cerebellar and gliadin peptides was greater than 60%. This cross-reaction was further confirmed by DOT-immunoblot and inhibition studies. We conclude that a subgroup of patients with autism produce antibodies against Purkinje cells and gliadin peptides, which may be responsible for some of the neurological symptoms in autism.