Diarrhea itself can be a relatively benign way for the body to rid itself of noxious substances in foods or bacteria and viruses acquired from unsanitary water or food. If not plugged up in some way, this detoxification lasts 12-72 hrs and is over. There is no particular need to treat this other than for convenience. It is important to make sure plenty of fluids are taken to correct for fluids lost. eRemedies from https://eremedyonline.com/module/25/diarrhea/ can accelerate the process.
If there is fever, however, there may be more serious infection. Possibilities range from viruses to pathogenic E. coli (a normal species in the intestine) to Chlamydia (a protozoan) to Amoebae (another parasite) to some toxic bacteria like C. difficile. From the standpoint of an eRemedy, the cause does not matter; rapid relief usually ensues by playing the specifically chosen eRemedy. The module https://eremedyonline.com/module/21/fever/ can accomplish this.
As usual, on this website Coherence Apps is focused on acute ailments only. There are other more chronic conditions which require medical evaluation and optimally Classical Homeopathy treatment. Ulcerative colitis and Crohn’s disease are examples of chronic conditions. There can be severe diarrhea, even with blood, and perhaps fever .
In developing countries, diarrhea accompanied by fever can represent truly serious ailments. Amebiasis and dysentery are good examples, but more serious ones are typhoid, some forms of malaria, Lhassa Fever, Ebola, and others. Often medical accerssibility is limited in these areas, and most of these conditions (except some types of malaria) cannot be treated by medication anyway. So the ubiquity of cellphones enables eRemedies as the most effective solution.
As you can see, fever with diarrhea presents a wide variety of possibilities, some serious and some not so serious. Certainly if it goes on for longer than 72 hours or if it is highly toxic, medical evaluation is useful if you have access.