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Int J Public Health. 2017 Feb;62(Suppl 1):103-111. doi: 10.1007/s00038-016-0920-y. Epub 2016 Nov 22.

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

Author information

1
Center for Public Health and Ecosystem Research (CENPHER), Hanoi University of Public Health, Hanoi, Vietnam. vuvantu@gmail.com.
2
Hoa Binh Provincial General Hospital, Hoa Binh, Vietnam. vuvantu@gmail.com.
3
Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland. vuvantu@gmail.com.
4
University of Basel, Basel, Switzerland. vuvantu@gmail.com.
5
Center for Public Health and Ecosystem Research (CENPHER), Hanoi University of Public Health, Hanoi, Vietnam.
6
Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland.
7
University of Basel, Basel, Switzerland.
8
Department of Water and Sanitation in Developing Countries (Sandec), Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland.
9
Hanoi University of Public Health, Hanoi, Vietnam.
10
International Livestock Research Institute, Hanoi, Vietnam.

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.

KEYWORDS:

Ascaris lumbricoides; Helminth; Human excreta; Vietnam; Waste reuse

PMID:
27872945
DOI:
10.1007/s00038-016-0920-y
[Indexed for MEDLINE]

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