What should you know about stomach bug from river water?

Rivers may contain bacteria, viruses or parasites from human or animal waste, especially after heavy rain or near untreated sewage. Swallowing water while swimming can be enough for infection. Gastroenteritis commonly presents with diarrhoea, nausea, vomiting, abdominal pain and appetite loss; fever can occur as well. A river exposure gives useful context, but it does not prove which germ is responsible. Rotavirus infection is another possible cause of a stomach bug.

Sip water or oral rehydration solution regularly, taking small amounts if nausea makes drinking difficult. Eat simple foods as tolerated and rest. Wash hands carefully, clean soiled bathroom surfaces and avoid preparing food for others while ill. Do not drink untreated river water; use a safe water source for drinking, brushing teeth and making ice. Note the place and time of exposure, the onset of symptoms and any travel or animal contact.

Contact a clinician if vomiting prevents drinking, diarrhoea persists, or symptoms follow a high-risk exposure. Get urgent help for blood in stool, severe or worsening abdominal pain, fainting, confusion, marked weakness or very little urine. Dehydration can develop quickly in children and older adults. People with kidney disease, immune problems or pregnancy should seek individual advice early rather than relying on general self-care.

Ask whether a stool test is appropriate, whether your water exposure changes treatment, which fluids are suitable, and how to protect household members from infection.