As if by magic, it also induced blinding headaches and caused mouth ulcers to randomly appear.

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The most common side effects reported in the trial were mouth ulcers, infections, fatigue and diarrhea.

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Shortly after the incident, people in the area began reporting a range of health issues, including stomach cramps, rashes, diarrhoea, mouth ulcers and aching joints.

BBC: Carole Cross

Anyone who develops mouth ulcers or suspicious lesions and lumps, or sees red or white patches in their mouth or tongue which do not heal within two weeks, should make an immediate appointment with a dentist.

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