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About three out of four visitors to India will incur some kind of gastrointestinal problem, whether or not they eat street food. There are three possible culprits: bacteria, worms or amoebas, although the latter is pretty rare.

"Medicals" shops like this one abound in India and if you know what you're looking for, you can get nearly all drugs very cheaply and without a prescription.

If you don't know what you're looking for, there's always someone there who will be more than happy to recommend a remedy for your symptoms.