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Detection of Cryptosporidium antigen in stool samples among diarrhoeic children
M M Hassan1, M Atta, M A el-Meniawy
1Department of Parasitology, Faculty of Medicine, Zagazig University, Egypt.
Insights
This study shows that detecting Cryptosporidium antigens in stool using ELISA is a highly sensitive diagnostic method for childhood diarrhea. The test accurately identifies infections and correlates with disease severity and patient age.
Area of Science:
- Medical Microbiology
- Immunodiagnostics
Background:
- Cryptosporidium infection is a significant cause of childhood diarrhea.
- Accurate and sensitive diagnostic methods are crucial for effective management.
Purpose of the Study:
- To evaluate the efficacy of a double antibody sandwich ELISA for detecting Cryptosporidium fecal antigen in children with diarrhea.
- To assess the correlation between antigen levels, patient age, feeding methods, and diarrhea severity.
Main Methods:
- A double antibody sandwich ELISA was employed using purified Cryptosporidium antiserum.
- Stool samples from infected children were analyzed for the presence of Cryptosporidium antigens.
Main Results:
- The ELISA detected Cryptosporidium antigens in 91.7% of infected children.
- Higher antigen levels were observed in younger children (<10 years) and bottle-fed infants.
- Elevated antigen levels correlated significantly with severe diarrhea forms (P < 0.01).
Conclusions:
- ELISA is a highly sensitive (91.7%) and specific (85%) method for diagnosing Cryptosporidium infections in children.
- The diagnostic method shows a strong correlation with diarrhea severity and patient age, aiding in clinical assessment.
Abstract:
A double antibody sandwich ELISA technique, using a chromatography purified Cryptosporidium antiserum (fractiuon 1), was applied to detect faecal antigen in children infected with Cryptosporidium suffering from diarrhoea. The assay could detect antigens in 55 out of 60 (91.7%) infected children. False positive reactions were detected in 4 children infected with E. histolytica and 2 children with Giardia. The mean level of copro-antigen was higher in children, below 10 years, than in older patients, with a highly significant difference. A significant higher mean copro-antigen level was found among children below 2 years of age who were bottle feeders when compared to those receiving breast feeding. Higher mean optical density readings was obtained in those with severe forms of diarrhoea than mild or moderate forms with statistically significant difference (P < 0.01). It was concluded that detection of Cryptosporidium antigens by ELISA technique in the stool samples is a highly sensitive (91.7%) and specific (85%) diagnostic method. It correlates well with the diarrhoea forms and the age of patients.