Comparison of thermotolerant coliforms and Escherichia coli densities in freshwater bodies
Braz. j. microbiol
;
43(2): 675-681, Apr.-June 2012. graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-644485
ABSTRACT
Fecal bacterial indicator analyses have been widely used for monitoring the water quality. This study was designed to determine the ratio between the density of Escherichia coli and other Thermotolerant Coliforms (TtC) bacteria from freshwater samples collected for a two-year period of monitoring. TtC were enumerated by membrane filtration on mFC agar. E. coli enumeration was done by two methods:
TtC colonies identified in mFC were inoculated in EC-MUG or water samples were filtered and inoculated in modified mTEC agar media, and both methods were compared for quantitative recovery of E. coli. The results pointed out a mean percentage of E. coli among other thermotolerant coliforms (E. coli/TtC ratio) of 84.3% in mFC media. Taking these results into account, a mandatory standard of 1000 thermotolerant coliforms would correspond to 800 E. coli and the adoption of these E. coli based standards will represent a major improvement for the monitoring of freshwater quality.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Microbiologia da Água
/
Qualidade da Água
/
Escherichia coli
/
Infecções por Escherichia coli
/
Coliformes
/
Água Doce
Limite:
Humanos
Idioma:
Inglês
Revista:
Braz. j. microbiol
Assunto da revista:
Microbiologia
Ano de publicação:
2012
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Companhia Ambiental do Estado de São Paulo/BR
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