Sorption Kinetics of Escherichia coli and Salmonella sp on Two Soil Layers Associated with a Groundwater Table in Yaounde, Cameroon (Central Africa)

Nola, Moı̈se; Njiné, Thomas; Boutin, Claude; Servais, Pierre; Messouli, Mohammed; Bidjeck, Louise Marie Ngo; Monkiédjé, Adolphe; Togouet, Serge Hubert Zébazé; Kemka, Norbert

doi:10.3390/ijerph2005030009

Cited by 10 publications

(8 citation statements)

References 39 publications

(52 reference statements)

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“…Bacterial retention on soil particles during water infiltration through soil column is sometimes selective (Nola et al . , ). It has been indicated that the inactivation rate of E. coli pathogenic strains in sand‐free groundwater was approximately 0.03 log unit per day, and 0.04 and 0.2 log unit per day for Salmonella typhimurium and Staphylococcus aureus , respectively (John & Rose ).…”

Section: Resultsmentioning

confidence: 99%

“…This could be due the variation of its retention potential or its inactivation on the soil layer particles during the infiltration or percolation of contaminated water. Bacterial retention on soil particles during water infiltration through soil column is sometimes selective (Nola et al 2005(Nola et al , 2006. It has been indicated that the inactivation rate of E. coli pathogenic strains in sand-free groundwater was approximately 0.03 log unit per day, and 0.04 and 0.2 log unit per day for Salmonella typhimurium and Staphylococcus aureus, respectively (John & Rose 2005).…”

Section: Nola Et Almentioning

confidence: 99%

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Detection of pathogenic Escherichia coli strains in groundwater in the Yaoundé region (Cameroon, Central Africa)

Nola

Nougang

Ewoti

et al. 2012

Water & Environment J

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This study was aimed at assessing the prevalence of pathogenic Escherichia coli strains, relative to the total count of E. coli, faecal coliforms and other heterotrophic mesophilic aerobic bacteria (HMAB) isolated in groundwater in the equatorial region of Cameroon (Central Africa). Bacteria were isolated using standard methods. Pathogenic E. coli strains were then identified using haemagglutination and antisera tests. The maximum abundance of HMAB, faecal coliforms and E. coli strains were 4.9 × 106, 5.6 × 103 and 1 × 103 colony‐forming units (CFU)/100 mL, respectively. The count of pathogenic E. coli strains reached 3 CFU/100 mL. The counts of commensal and pathogenic E. coli strains underwent temporal and spatial fluctuations. In 21% of sampling sites, the abundance of faecal coliforms was significantly correlated to that of E. coli (P < 0.05). However, the isolated bacterial count was not significantly correlated to that of the pathogenic E. coli strains (P > 0.05). The bacteria abundance dynamics may be impacted by many interacting factors.

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Section: Resultsmentioning

confidence: 99%

Section: Nola Et Almentioning

confidence: 99%

Detection of pathogenic Escherichia coli strains in groundwater in the Yaoundé region (Cameroon, Central Africa)

Nola

Nougang

Ewoti

et al. 2012

Water & Environment J

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“…Nola et al (2005) found a rapid attachment within 30 min for both E. coli and Salmonella spp. This may be explained by attachment.…”

Section: Discussionmentioning

confidence: 92%

“…This may be explained by attachment. Nola et al (2005) found a rapid attachment within 30 min for both E. coli and Salmonella spp. For Salmonella spp., a high proportion of cells attached to the soil particles with a K f of 506 and 847 in two soil types.…”

Section: Discussionmentioning

confidence: 92%

Leaching of Salmonella enterica in Clay Columns Comparing Two Manure Application Methods

Bech¹,

Dalsgaard²,

Jacobsen³

et al. 2010

Ground Water

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Transfer of zoonotic bacterial pathogens through intact soil columns was monitored in an outdoor lysimeter over 36 d. Manure spiked with Salmonella enterica serovar Senftenberg was applied to either the soil surface or injected 0.08 m into the soil to compare leaching associated with the two manure application methods. The highest concentrations of S. enterica (up to 60,000 S. enterica CFU/mL) were detected on Day 1 in the first drainage samples, with measurable but declining concentrations persisting for 10 to 36 d depending on replicate columns. The total recovery of leached S. enterica in drainage samples ranged from 0.08% to 13.8%. When comparing the two application methods, there was no statistically significant difference in the leaching concentration of S. enterica at each sampling time during the study period. In addition, comparison of enumerations by selective plating and real-time polymerase chain reaction yielded similar concentrations of S. enterica, indicating that mainly viable and culturable cells were leached from the columns. When the experiment was terminated, the fluorescent dye Acid Yellow was applied to four selected columns and the distribution of dye and size of active (dye-stained) pores were measured with a digital camera and visualization software. The profiles showed that the area covered by active pores ranged from 0.1% to 3.6%. The relatively small fraction of active pores in the soil profile was consistent with the evidence of rapid transport of S. enterica and chloride in the columns.

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“…Cette minéralisation est liée aux ions contenus dans les eaux analysées ainsi qu'à la nature équatoriale du sol de la zone de Yaoundé (NOLA et al, 2006). En effet, RODIER (1996) La caractérisation morphologique de C. cayetanensis au microscope montre que les oocystes sont arrondis, mesurent de 8 à 10 µm de diamètre et se présentent sous deux formes (sporulées et non sporulées).…”

Section: Discussionunclassified

Isolement et mise en évidence des oocystes de Cyclospora cayetanensis dans un hydrosystème polysaprobe en zone équatoriale, Afrique Centrale

Ajeagah

Kamguep

Nola

et al. 2014

rseau

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Peu de données sont disponibles sur la distribution des Apicomplexa parasites du tube digestif de l’homme. Ils causent pourtant des maladies diarrhéiques de très grande envergure. Une étude menée de janvier à août 2011, dans le cours d’eau Olézoa à Yaoundé (Cameroun), a visé à rechercher et caractériser les oocystes de Cyclospora cayetanensis. Les échantillonnages ont été effectués en amont et en aval du cours d’eau, sur deux stations localisées en zone fortement anthropisées. L’identification des oocystes de C. cayetanensis isolés à l’aide de l’observation directe après coloration au Lugol et selon la technique de Ziehl-Neelsen, a montré qu’ils sont constitués de deux sporocystes contenant chacun deux sporozoïtes. La dynamique d’abondance de ce microorganisme est significativement corrélée à la turbidité, à la température et au pH de l’eau (p < 0,01). Par ailleurs, les formes non sporulées sont plus abondantes que les formes sporulées dans l’environnement et sont fortement corrélées aux teneurs en oxygène dissous qui est un paramètre très important pour leur sporogénèse. En amont du cours d’eau, l’abondance la plus élevée de C. cayetanensis a été de 407 oocystes•L-1 et la valeur enregistrées en aval été de 250 oocystes•L-1. La population de C. cayetanensis observée a été largement dominée par les formes non sporulées de taille 8 µm. La concentration des oocystes la plus élevée en utilisant la technique directe et celle de Ziehl-Neelsen a été enregistrée respectivement au cours des mois de juin et juillet; ces périodes se situent respectivement à la fin de la petite saison des pluies et au début de la saison sèche.

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Sorption Kinetics of Escherichia coli and Salmonella sp on Two Soil Layers Associated with a Groundwater Table in Yaounde, Cameroon (Central Africa)

Abstract: Abstract:A laboratory study has been carried out on two soil layers (H X and H Y

Cited by 10 publications

References 39 publications

Detection of pathogenic Escherichia coli strains in groundwater in the Yaoundé region (Cameroon, Central Africa)

Detection of pathogenic Escherichia coli strains in groundwater in the Yaoundé region (Cameroon, Central Africa)

Leaching of Salmonella enterica in Clay Columns Comparing Two Manure Application Methods

Isolement et mise en évidence des oocystes de Cyclospora cayetanensis dans un hydrosystème polysaprobe en zone équatoriale, Afrique Centrale

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