Deposition of Cryptosporidium oocysts in streambeds

Applied and Environmental Microbiology
Kristin E SearcyThomas Harter

Abstract

The transfer of Cryptosporidium oocysts from the surface water to the sediment beds of streams and rivers influences their migration in surface waters. We used controlled laboratory flume experiments to investigate the deposition of suspended Cryptosporidium parvum oocysts in streambeds. The experimental results demonstrate that hydrodynamic interactions between an overlying flow and a sediment bed cause oocysts to accumulate in the sediments and reduce their concentrations in the surface water. The association of C. parvum with other suspended sediments increased both the oocysts' effective settling velocity and the rate at which oocysts were transferred to the sediment bed. A model for the stream-subsurface exchange of colloidal particles, including physical transport and physicochemical interactions with sediment grains, accurately represented the deposition of both free C. parvum oocysts and oocysts that were attached to suspended sediments. We believe that these pathogen-sediment interactions play an important role in regulating the concentrations of Cryptosporidium in streams and rivers and should be taken into consideration when predicting the fate of pathogens in the environment.

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Citations

Jul 29, 2011·Environmental Science & Technology·Stanley B Grant, Ivan Marusic
Jan 11, 2012·Environmental Science & Technology·Yuanyuan LiuThanh H Nguyen
Oct 16, 2013·Environmental Science & Technology·Ankie SterkAna Maria de Roda Husman
Dec 14, 2011·Applied and Environmental Microbiology·Aurélien DumètreIsabelle Villena
Jun 4, 2015·Environmental Science & Technology·Jennifer D DrummondAaron I Packman
Nov 11, 2008·Water Research·Céline MonsLaurent Moulin
Jul 15, 2015·Journal of Applied Microbiology·M N S Al-SabiH L Enemark
Aug 20, 2015·Environmental Science & Technology·Morvarid AzizianMichael J Stewardson
Jul 10, 2012·The Science of the Total Environment·Hugo Ramiro PomaVerónica Beatriz Rajal
May 13, 2010·FEMS Microbiology Ecology·Clemens AugspurgerTom J Battin
Oct 17, 2017·Applied and Environmental Microbiology·Xia LuoKristen L Jellison
Nov 1, 2016·Applied and Environmental Microbiology·Xia LuoKristen Jellison
Aug 12, 2008·Journal of Environmental Quality·W A MillerE R Atwill
Jan 10, 2021·International Journal for Parasitology·Muofhe Grace MphephuMaggy Ndombo Benteke Momba
May 15, 2010·Environmental Science & Technology·Dao JanjaroenThanh H Nguyen

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