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Ascaris lumbricoides egg die-off in an experimental excreta storage system and public health implication in Vietnam

Author

Listed:
  • Tu Vu-Van

    (Hanoi University of Public Health
    Hoa Binh Provincial General Hospital
    Swiss Tropical and Public Health Institute
    University of Basel)

  • Phuc Pham-Duc

    (Hanoi University of Public Health)

  • Mirko S. Winkler

    (Swiss Tropical and Public Health Institute
    University of Basel)

  • Christian Zurbrügg

    (Eawag: Swiss Federal Institute of Aquatic Science and Technology)

  • Jakob Zinsstag

    (Swiss Tropical and Public Health Institute
    University of Basel)

  • Huong Thi Thanh

    (Hanoi University of Public Health)

  • Tran Huu Bich

    (Hanoi University of Public Health)

  • Hung Nguyen-Viet

    (Hanoi University of Public Health
    International Livestock Research Institute)

Abstract

Objectives We studied the influence of different additive materials (lime, and rice husk) and aeration conditions on Ascaris lumbricoides egg die-off in 24 vaults of an experimental excreta storage unit. Methods Excreta samples were collected once every two weeks over a 181-day period. Temperature, pH, and moisture content were recorded. A. lumbricoides eggs were quantitatively analyzed by the Romanenko method, which identified and counted live and dead eggs. Results From the first sampling (0 storage day) to the final sampling (181 storage days) the average percentage of viable A. lumbricoides eggs decreased gradually from 76.72 ± 11.23% (mean ± SD) to 8.26 ± 5.20%. The storage time and the high pH value significantly increased the die-off of helminth eggs. Over 181 storage days, all vaults option effectively reduced A. lumbricoides eggs die-off. Conclusions The best vault option, with aeration and 10% lime per total weight, met the WHO standard for excreta treatment on the 111th storage day.

Suggested Citation

  • Tu Vu-Van & Phuc Pham-Duc & Mirko S. Winkler & Christian Zurbrügg & Jakob Zinsstag & Huong Thi Thanh & Tran Huu Bich & Hung Nguyen-Viet, 2017. "Ascaris lumbricoides egg die-off in an experimental excreta storage system and public health implication in Vietnam," International Journal of Public Health, Springer;Swiss School of Public Health (SSPH+), vol. 62(1), pages 103-111, February.
    • Handle: RePEc:spr:ijphth:v:62:y:2017:i:1:d:10.1007_s00038-016-0920-y
    DOI: 10.1007/s00038-016-0920-y
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    1. Kathrin Ziegelbauer & Benjamin Speich & Daniel Mäusezahl & Robert Bos & Jennifer Keiser & Jürg Utzinger, 2012. "Effect of Sanitation on Soil-Transmitted Helminth Infection: Systematic Review and Meta-Analysis," PLOS Medicine, Public Library of Science, vol. 9(1), pages 1-17, January.
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