Stuttgart (Germany), April 27 -- Over 800 people have been affected by a norovirus outbreak at a festival in south-west Germany, media reports said.

The infection causes vomiting, diarrhoea, nausea, and in some cases high fever, body ache, and headache.

According to a BBC report, people attending the festival caught the bug in a marquee at the Stuttgart spring festival last weekend.

It is still unclear how the virus was first contracted, but cases of infection have risen during the week.

Meanwhile, Stuttgart officials are certain that the infections was not linked to food or drink made available in the festival tent all the samples had tested negative.

The citys health department conducted tests on marquee staff, dishes, and water us...