Of particular importance among these enteric viruses are a subset of bacteriophage viruses that specifically infect E. coli cells, called coliphages. Especially, F-specific (MSC) and somatic (SC) coliphages have been proposed in recent years as more reliable indicators, since their resistance to remain in the environment is greater than that of bacteria.  
These viruses are generated almost exclusively in human and animal feces, reproducing in a controlled manner under specific conditions of high densities of coliphages and, of course, E. coli host cells at elevated temperatures.

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