Etiologic agents in acute vs persistent diarrhea in children under three years of age in peri-urban Lima, Perú
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C F Lanata1, R E Black, D Maúrtua
1Instituto de Investigación Nutricional, Lima, Perú.
Insights
Frequent re-infections, not persistent pathogens, prolong diarrhea in young children in developing countries. Host factors may also increase susceptibility and hinder recovery, necessitating further research for public health interventions.
Area of Science:
- Pediatrics
- Infectious Diseases
- Public Health
Background:
- Diarrheal diseases are a major cause of mortality in developing countries.
- Persistent diarrhea in young children is a significant public health concern.
- Understanding the etiology of persistent diarrhea is crucial for effective interventions.
Purpose of the Study:
- To investigate the association between enteropathogens and persistent diarrhea in young children.
- To determine if persistent infections or frequent re-infections contribute to prolonged diarrheal episodes.
- To identify factors influencing the duration and severity of diarrhea.
Main Methods:
- A longitudinal study involving 677 children under three years old in Lima, Perú.
- Stool cultures were performed weekly during diarrheal episodes over 27 months.
- Analysis focused on children not receiving antibiotics prior to culture, controlling for age, season, and anthropometric status.
Main Results:
- No specific enteropathogen was consistently associated with persistent diarrhea.
- Mixed infections did not increase in persistent diarrhea cases compared to acute cases.
- Enteropathogen isolation rates were similar across weeks of illness, with no evidence of persistent infection within single episodes.
Conclusions:
- Frequent re-infections with common enteropathogens likely contribute to prolonged diarrhea in high-incidence settings.
- Host factors, such as micronutrient deficiencies, may increase susceptibility and impede recovery.
- Further research into host factors is needed to develop public health strategies against persistent diarrhea.
Abstract:
In a longitudinal study of acute and persistent diarrhea in 677 children less than three years old in a peri-urban community of Lima, Perú, during 27 months of surveillance, stools were cultured at the beginning of each diarrheal episode and on each subsequent week of illness. Analyzing stool cultures only from children who had not received antibiotic treatment in the 48 h prior to the culture, no association was found between any enteropathogen and persistent diarrhea. We did not find any increase in mixed infections in persistent diarrhea episodes as compared with acute diarrhea, controlling for age, season and anthropometric status. The isolation rate for any given enteropathogen was similar during the first, second, third or later week of illness, but when the presence of a specific enteropathogen was sought in sequential stools within a single episode, no evidence of persistent infection was found. This study shows that in developing countries with a high incidence of diarrheal diseases frequent re-infections with enteropathogens prevalent in the population are one reason for prolonged illnesses. Host factors that increase susceptibility to infection or decrease recovery from illness may also play a role. Further studies of these factors, such as micronutrient deficiencies, are needed to identify a public health intervention to control persistent diarrhea, a condition associated with mortality in many developing countries.