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Schistosoma haematobium Egg Excretion does not Increase after Exercise: Implications for Diagnostic Testing

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  • 1 Unité de Formation et de Recherche Biosciences, Université Félix Houphouët-Boigny, Abidjan, Côte d’Ivoire;
  • 2 Centre Suisse de Recherches Scientifiques en Côte d’Ivoire, Abidjan, Côte d’Ivoire;
  • 3 Swiss Tropical and Public Health Institute, Basel, Switzerland;
  • 4 University of Basel, Basel, Switzerland;
  • 5 Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, California;
  • 6 Division of Epidemiology, Stanford University School of Medicine, Stanford, California;
  • 7 Department of Medicine, University of Toronto, Toronto, Ontario, Canada;
  • 8 Divisions of General Internal Medicine and Infectious Diseases, Toronto General Hospital, University Health Network, Toronto, Ontario, Canada

Children are frequently invited to exercise before micturition, as it is believed that this activity will result in higher Schistosoma haematobium egg excretion, and hence, increases sensitivity of microscopic diagnoses. However, the evidence of this recommendation is scant. In the study presented here, 257 children, aged 2–15 years from south Côte d’Ivoire, provided urine samples for microscopy on consecutive days; one sample without prior exercise and one sample after exercise. Comparing the same individuals without and with prior exercise, sample positivity for S. haematobium (25.7% versus 23.0%, P = 0.31) and mean egg counts (10.2 eggs/10 mL versus 8.5 eggs/10 mL, P = 0.45) did not differ. Exercise before urine collection does not appear to increase S. haematobium egg excretion.

Author Notes

Address correspondence to Isaac I. Bogoch, Divisions of General Internal Medicine and Infectious Diseases, Toronto General Hospital, 14EN 209, 200 Elizabeth Street, Toronto, ON, Canada M5G 2C4. E-mail: isaac.bogoch@uhn.ca

These authors contributed equally to the manuscript.

Financial support: I. I. B. was supported by a grant from the MSH UHN AMO Innovation Fund.

Authors’ addresses: Jean T. Coulibaly and Eliézer K. N’Goran, Unité de Formation et de Recherche Biosciences, Université Félix Houphouët-Boigny, and Centre Suisse de Recherches Scientifiques en Côte d’Ivoire, Abidjan, Côte d’Ivoire, E-mails: couljeanvae@yahoo.fr and eliezerngoran@yahoo.fr Jason R. Andrews and Nathan C. Lo, Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, CA, E-mails: jandr@stanford.edu and ncl2@stanford.edu. Nathan C. Lo, Division of Epidemiology, Stanford University School of Medicine, Stanford, CA Jürg Utzinger, and Jennifer Keiser, Swiss Tropical and Public Health Institute, and University of Basel, Basel, Switzerland, E-mails: juerg.utzinger@swisstph.ch and jennifer.keiser@swisstph.ch Isaac I. Bogoch, Department of Internal Medicine and Infectious Diseases, Toronto General Hospital, Toronto, Ontario, Canada, E-mail: isaac.bogoch@uhn.ca.

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