Jul.3 (GMM) On the eve of the British grand prix weekend, a health threat in the region of the Silverstone circuit has emerged.

Germany's Bild-Zeitung newspaper is reporting that the drinking water in the immediate vicinity of the Northamptonshire venue has been found by local health authorities to be contaminated with parasites.

Bild claims that the parasite in question causes diarrhoea, stomach cramps and fever -- just as a quarter of a million spectators prepare to descend on Silverstone for the formula one event.