And some remain unwell upon their return home. Gas, bloating, rumbling, cramps it never seems to end. The commonest causes of Travelers Diarrhea are bacterial infections, such as E. coli, salmonella, shigella and campylobacter. They usually have a brief incubation period of 24 to 48 hours. Therefore if it strikes you on the plane home or as you walk through your front door, you probably goofed on the last day of your vacation.
Parasites are a much less common cause of diarrhea in travellers.
As well, they do not usually strike quite as acutely. The commonest parasitic infections included giardiasis and amebiasis. Two slightly newer or emerging infections are cryptosporidium and cyclospora. Many travellers and non-travellers alike seem to acquire Entamoeba coli, Endolimax nana, Entamoeba hartmanni and Dientamoeba fragilis . These latter amoebas are usually non-pathogenic, that is, they don't cause much in the way of illness.