File photo taken on Feb. 15, 2012 shows cows on a field of New Zealand dairy giant Fonterra in western North Island's Taranaki area in New Zealand. Fonterra said early Saturday that on Wednesday tests indicated the potential presence of a strain of Clostridium (Clostridium Botulinum) in a whey concentrate sample, which can cause botulism. The whey protein affected was produced in May 2012 and the company said a dirty pipe at its Hautapu plant in North Island's Waikato region was responsible for the contamination. The scare involves 40 tonnes of tainted concentrated whey used to make 900 tonnes of food including infant formula, yogurt, sports and protein drinks across seven countries, including Australia, China, Malaysia, Thailand, Saudi Arabia and Vietnam. (Xinhua/Huang Xingwei)