It is important to point out that TC is a group that includes
enteric and non-enteric bacteria [43], and the lower TC
counts could be related to interference of non-coliform
bacteria that inhibit coliform bacteria growth, as has been
shown by Burlingame et al. [44], when m-Endo medium
was used. Moreover, FC cultivated in m-FC medium at
44.5°C has been reported to promote non-E. coli thermophilic
growth [45], which can produce a FC overestimation
or a false positive reading. The culture media used
are those recommended by Standard Methods [26] and
also correspond to the official Mexican methods [46] for
the enumeration of TC and FC in water samples. However,
the use of other methods to measure indicator bacteria
that show more specific results, mainly for water from
tropical and subtropical areas [45], is recommended for
subsequent studies.
It is important to point out that TC is a group that includesenteric and non-enteric bacteria [43], and the lower TCcounts could be related to interference of non-coliformbacteria that inhibit coliform bacteria growth, as has beenshown by Burlingame et al. [44], when m-Endo mediumwas used. Moreover, FC cultivated in m-FC medium at44.5°C has been reported to promote non-E. coli thermophilicgrowth [45], which can produce a FC overestimationor a false positive reading. The culture media usedare those recommended by Standard Methods [26] andalso correspond to the official Mexican methods [46] forthe enumeration of TC and FC in water samples. However,the use of other methods to measure indicator bacteriathat show more specific results, mainly for water fromtropical and subtropical areas [45], is recommended forsubsequent studies.
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