Impact of vitamin A on selected gastrointestinal pathogen infections and associated diarrheal episodes among children in Mexico City, Mexico.
J Infect Dis
; 194(9): 1217-25, 2006 Nov 01.
Article
en En
| MEDLINE
| ID: mdl-17041847
ABSTRACT
BACKGROUND:
The overall effect of vitamin A supplementation on diarrheal disease in community trials may result from its effect on specific diarrheal pathogens.METHODS:
We conducted a placebo-controlled, double-blind trial of the prophylactic effect of vitamin A on gastrointestinal pathogen infections and clinical symptoms among 188 children in Mexico City, Mexico, from January 1998 to May 1999. Children 6-15 months of age were randomly assigned to receive either a vitamin A supplement (for children <12 months of age, 20,000 international units [IU] of retinol; for children > or =12 months of age, 45,000 IU of retinol) every 2 months or a placebo and were followed for up to 15 months. Stool samples, collected semimonthly, were screened for enteropathogenic Escherichia coli (EPEC), enterotoxigenic E. coli (ETEC), Shiga toxin-producing E. coli (STEC), enteroinvasive E. coli (EIEC), and Giardia lamblia.RESULTS:
Vitamin A supplementation reduced the prevalence of EPEC infections (rate ratio [RR], 0.52 [95% confidence interval {CI}, 0.23-0.86]) and led to shorter durations of both EPEC and ETEC infections. Supplementation also reduced the prevalence of EPEC-associated diarrhea (RR, 0.41 [95% CI, 0.16-1.00]), EPEC-associated fever (RR, 0.15 [95% CI, 0.02-0.98]), and G. lamblia-associated fever (RR, 0.27 [95% CI, 0.13-0.80]). Finally, children who received vitamin A supplementation had shorter durations of EPEC-associated diarrhea than did children who did not receive supplementation but had longer durations of G. lamblia-associated diarrhea.CONCLUSIONS:
These results suggest that the effect of vitamin A supplementation on clinical outcomes may be pathogen dependent.
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Bases de datos:
MEDLINE
Asunto principal:
Vitamina A
/
Diarrea
/
Enfermedades Gastrointestinales
Tipo de estudio:
Clinical_trials
/
Prevalence_studies
/
Risk_factors_studies
Límite:
Female
/
Humans
/
Infant
/
Male
País/Región como asunto:
Mexico
Idioma:
En
Revista:
J Infect Dis
Año:
2006
Tipo del documento:
Article
País de afiliación:
Estados Unidos