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It was later established Hannah had suffered a gastric volvulus - a rare condition caused by twisted stomach.

Exploratory surgery identified the volvulus of ileum, a rare but serious cause of small bowel obstruction.

Exploratory surgery identified the volvulus of ileum, a rare but serious cause of small bowel obstruction.

This protein is structurally similar to those made by O. volvulus, and antibodies that react against O. volvulus do the same against leiomodin-1, suggesting an autoimmune response.

One key clue: Areas with nodding syndrome also had high rates of onchocerciasis, an infection with the parasitic worm Onchocerca volvulus.