Related Experiment Videos
[Campylobacter jejuni infection in children of a rural community]
H Villafán1, R Ordóñez, A Tello
1Centro de Investigaciones sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, D.F., México.
Insights
Campylobacter jejuni colonization in children rarely causes diarrhea initially. Subsequent infections linked to prior diarrhea increase illness risk, independent of toxin or adhesion factors.
Area of Science:
- Microbiology
- Pediatrics
- Infectious Diseases
Background:
- Campylobacter jejuni is a leading cause of bacterial gastroenteritis globally.
- Understanding colonization dynamics and disease risk in children is crucial for public health.
Purpose of the Study:
- To investigate the longitudinal colonization patterns of Campylobacter jejuni in rural children.
- To determine the relationship between C. jejuni colonization, age, and the incidence of diarrhea.
- To explore the role of specific bacterial virulence factors in disease development.
Main Methods:
- Longitudinal study of 75 rural children from birth.
- Fortnightly fecal cultures and cultures during diarrheal episodes.
- Analysis of illness-to-infection ratios and association with bacterial virulence factors (enterotoxin, cytotoxicity, adherence).
Main Results:
- Only 25% of children initially colonized in the first year and 12% in the second year experienced diarrhea.
- Age at initial C. jejuni infection was not a significant risk factor for disease.
- A higher illness-to-infection ratio was observed during subsequent colonizations if the initial infection was associated with diarrhea (P < 0.05).
- Diarrhea risk was not linked to the production of cholera-like enterotoxin, HeLa cell cytotoxicity, or HEp-2 cell adherence by infecting strains.
Conclusions:
- Initial Campylobacter jejuni colonization in young children has a low probability of causing diarrhea.
- Subsequent C. jejuni infections pose a greater diarrheal risk if prior infections were symptomatic.
- Bacterial virulence factors like enterotoxin production and adherence do not appear to influence the risk of diarrhea during C. jejuni colonization in this cohort.
Abstract:
Colonization of the intestine with Campylobacter jejuni was followed longitudinally from birth in a cohort of 75 rural children with fecal cultures taken every fortnight and every time they had diarrhea. Only 25% of children initially colonized with C. jejuni during the first year of life, and 12% of children initially colonized during the second had diarrhea. The age at which a child was initially infected with C. jejuni was not a risk factor in relation with presence of disease. A higher illness-to-infection ratio (P less than 0.05) was found during subsequent colonization with C. jejuni when initial infection was associated with diarrhea. Risk of diarrhea during initial or subsequent colonization with C. jejuni was not related with the production of cholera-like enterotoxin, a cytotoxic active on HeLa cells or with adhesive ability to HEp-2 cells by the infecting strains.