Chlorination treatment as a control of Aeromonas spp. in drinking water

Authors: Hernandez P.; Garcia R.R.D.; Estrada D.D.E.M.

Source: International Journal of Environmental Health Research, Volume 7, Number 4, 1 December 1997 , pp. 355-359(5)

Publisher: Taylor and Francis Ltd

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Abstract:

During the 1991 cholera epidemic in Caracas metropolitan area, Aeromonas spp. were isolated with very high frequency as the only pathogen from suspected cholera patients with watery stools. The Aeromonas hydrophila group are gram negative rods, often found in the environment, particularly in water and sewage. This study was undertaken as a contribution to understanding the role of tap water as a vehicle in the transmission of this microorganism. Samples taken at random from different city neighbourhoods and raw water samples were analyzed by streaking directly on inositol-brilliant green-bile salts agar and starchampicillin agar. At the same time, subset samples were filtered through a 0.45 mum Millipore membrane filter. The membrane was enriched in alkaline peptone water before streaking on the selective agars. Isolates were identified using biochemical tests. Residual chlorine levels and water temperatures in the samples were determined to correlate these parameters with the presence of the microorganism. The Aeromonas group was isolated only from raw water samples, proving in this way that residual chlorine levels in the range 0.29-0.47 mg/L were effective to control these microorganisms.

Keywords: AEROMONAS; DRINKING WATER; CHLORINE LEVELS

Language: English

Document Type: Research article

Publication date: 1997-12-01

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