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Journal of Clinical Microbiology, October 2003, p. 4525-4530, Vol. 41, No. 10
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.10.4525-4530.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Etiology of Acute Diarrhea in Adults in Southwestern Nigeria

Iruka N. Okeke,1,2* Oladipupo Ojo,1 Adebayo Lamikanra,1 and James B. Kaper2

Department of Pharmaceutics, Obafemi Awolowo University, Ile-Ife, Nigeria,1 Department of Microbiology and Immunology and Center for Vaccine Development, University of Maryland School of Medicine, Baltimore, Maryland 212012

Received 16 May 2003/ Returned for modification 11 July 2003/ Accepted 25 July 2003

Stool specimens from 113 adult outpatients with diarrhea in southwestern Nigeria and 63 controls were examined for bacterial and parasitic enteric pathogens. Enterohemorrhagic Escherichia coli (EHEC) (P < 0.02), enteroaggregative E. coli (EAEC) (P < 0.02), and Entamoeba histolytica (P < 0.0002) were significantly associated with diarrhea. Salmonella, Shigella, nontoxigenic Vibrio cholerae, other categories of diarrheagenic E. coli, as well as a variety of helminths were recovered more frequently from the stools of patients than from the stools of controls but did not show a significant association with disease. Multiple pathogens were recovered from 36.3% of specimens, and bloody diarrhea was commonly associated with E. histolytica and diarrheagenic E. coli infections. The majority of EHEC isolates were non-O157 strains that carried the stx2 gene. Of the 23 EHEC-infected patients, 12 (52.2%) presented during the 10th week of the study. EHEC strains isolated within this cluster were more likely to hybridize with the enterohemolysin gene probe, to be nonmotile and sorbitol positive, and to fail to agglutinate O157 antisera. Pulsed-field gel electrophoresis demonstrated that the only strains with XbaI profiles that occurred more than once were isolated during the 10th and 11th weeks of the study, suggesting an outbreak. The study has demonstrated that E. histolytica, EHEC, and EAEC are important diarrheal pathogens within the study area and that sporadic and epidemic EHEC infections occur in developing as well as developed countries. Routine surveillance for diarrheagenic E. coli, even only at the tertiary-care level, would be useful in identifying outbreaks and assist in identifying environmental reservoirs and transmission routes.

* Corresponding author. Present address: Department of Biology, Haverford College, 370 Lancaster Ave., Haverford, PA 19041. Phone: (610) 896-1470. Fax: (610) 896-4963. E-mail: iokeke{at}haverford.edu.

Journal of Clinical Microbiology, October 2003, p. 4525-4530, Vol. 41, No. 10
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.10.4525-4530.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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