2010-04-23 21:11 –Nelspruit –The Olifants River in Mpumulanga is highly contaminated,researchers said on Friday. Microbiologist at the Council for Scientific and Industrial Research (CSIR),Martella du Preez,said all the sites along the river showed mild to heavy microbial contamination most likely due to untreated,or poorly-treated,sewage flowing into it. [...]