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Like your doctor said, symptoms of infection generally take some time before they show up. The average time I would depend on the type of microbes consumed.
The medicines prescribed to you should take care of major bacteria and parasites. And it's good to know that you do not have many symptoms apart from stomach upset
. Please continue the medicines as suggested and I am sure that should nullify any chances of you getting symptoms of major infection.
We can plan tests and investigations if you develop any symptoms. And don't worry, those can be treated.
Hope this answers your query.