Lower digestive symptoms for the last few days while on trip. help!?

Parasitic, bactera?: Good morning, i just returned from a trip to brazil and argentina; i was worried during the trip about the chance of digestive symptoms due to exposure to bacteria and parasites, we are not immune to. We may rule out bacterial infections such as dysentery, salmonella, parasites and amoeba, and infections due to viruses, etc. Tests are needed if the symptoms continue, if no relief from Imodium (loperamide) etc.