How much of number of shigella will be there in a given population of Fecal coliform.
How much of shigella dose is risky to cause harmful affect in human being?
hi see this link
https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC)
Shigella has a very low infectious dose. It can be as low as 10 bacteria but most articles establish the infectious dose between 10 and 200 bacteria. Generation time is defined as the amount of time required for a bacterial population to double its number and for Shigella is around 40 min so even a low count can be harmful. That's why in my country a single case is considered an outbreak.
Certainly, most opinions are in the sense that a few number of Shigella are just necessary to be an infective dose, but proportion of this bacteria in total population of fecal coliforms I think should be quite variable from place to place.
Fecal Coliform is only a parameter of the existence of newly fecal matter contamination in a medium. Shigella existence (regardless of its number) in the fecal matter is a parameter of the 'burden' of Shigella infection in the community. There is no linear correlation between the number of fecal Coliform and the number of Shigella in a medium
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