Immune responses to Helicobacter pylori infection in children with intellectual disabilities.
Three-quarters of institutionalized children with ID in Tehran already carry H. pylori, and the risk keeps climbing with age and time in care.
01Research in Context
What this study did
Douraghi et al. (2012) checked blood samples from children living in Tehran residential centers. They wanted to know how many carried Helicobacter pylori, a stomach germ spread by saliva, vomit, and stool.
All kids had intellectual disability. The team noted each child's age and how long they had lived in the center.
What they found
Three out of every four children tested positive. Teens and kids who had lived there longest showed the highest rates.
The numbers match earlier adult data from the same region, hinting that infection starts early and piles up over time.
How this fits with other research
Williams et al. (2002) saw the same climb in adults: the longer someone stayed institutionalized, the more likely they carried the germ. Their 80–90% rate in long-stay adults lines up almost perfectly with the 75% child rate here, showing risk builds year after year.
Plant et al. (2007) used the same blood-test design for Toxoplasma in northern Iranian centers and found a similar 77% positive rate. Yet that study says the rate merely mirrors the general public, so no extra action is needed. The contrast looks like a contradiction: one high rate triggers alarm, the other shrugs. The difference is context—Toxoplasma is common everywhere in that region, while H. pylori clusters inside institutions, pointing to hygiene and crowding, not geography.
Richman et al. (2001) add a darker layer. Their 50-year chart review links heavy H. pylori infection to stomach cancers that caused nearly half of cancer deaths in institutional adults. Together the papers trace a timeline: child infection → decades of inflammation → higher cancer risk later.
Why it matters
If you serve youth in group homes, picture three quarters of your clients carrying a ulcer- and cancer-linked germ. Simple steps—annual stool antigen tests, separate toothbrushes, prompt disinfection of vomit or diarrhea—can catch infection early and break the chain before it follows them into adulthood.
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02At a glance
03Original abstract
Infection with Helicobacter pylori was assessed through serum H. pylori IgG antibody in children with intellectual disabilities (ID). The sero-status of cytotoxin-associated gene A (CagA) was determined as a risk determinant for severe H. pylori-associated diseases. In total, 210 children with ID were included who were permanent resident of three institutes in Tehran. Medical history and demographic data were collected by reviewing the medical file records. The anti H. pylori IgG antibody was detected in serum of 74.8% of children using ELISA. Significant correlations were found between the rate of infection and age (P = 0.001) and duration of institutionalization (P = 0.018). The likelihood of H. pylori IgG positive response increased with age with the highest response in 15-18 years age group (OR = 6.66, 95% CI: 2.14-20.17; P = 0.001). Similarly, the average titers of H. pylori IgG antibody were increased with age. The institutionalization duration of more than 49 months affected the likelihood of H. pylori IgG positive response (OR = 2.437, 95% CI: 1.12-5.26; P = 0.023). Anti-CagA titers were higher than 5arbU/ml in 92 (58.6%) children, indicating a positive response against CagA protein. The titer of H. pylori IgG was significantly higher in CagA-positive (mean ± SE = 51.04 ± 3.41) than in CagA-negative children (38.07 ± 4.18; P = 0.017). In contrast to total H. pylori IgG titers, anti-CagA antibody had non-regular trend of alterations with age. The seropositivity rate of H. pylori infection in ID children was higher than other reports in healthy children from various regions of the country. The risk of H. pylori infection is increased with age and duration of institutionalization. The serostatus of CagA in children with IDs has not been reported so far. The regular monitoring of the CagA-positive carriers is recommended; since CagA positive cases carry the risk of progression of infection toward severe H. pylori associated sequels such as gastric cancer and duodenal ulcers.
Research in developmental disabilities, 2012 · doi:10.1016/j.ridd.2011.11.010