Rivers in South Africa's famed Kruger game park are contaminated with cholera floating downstream from Zimbabwe, but the virus poses no threat to visiting tourists, a spokesperson has said.

"It's in the rivers, but there is no threat for people unless they go and drink from the river or swim in it, which they are not allowed to do," park spokesperson Raymond Travers told AFP.

"Each camp has its own water reservoir, treated with chemicals. There's no danger of cholera coming into the drinking water."

The deadly but treatable disease spreads in dirty water. More than 2700 people have died of cholera in Zimbabwe along with dozens of others in neighbouring countries.

In South Africa, more than 2600 cases have been reported and 31 people have died ? including 19 in the rural province of Mpumalanga that is home to Kruger.

South Africa's biggest wildlife reserve attracts 1.3 million visitors every year.