Hans Troedsson said on Monday quality issues could occur anywhere from the farm to the retail outlet . Head of China 's health watchdog concerned over tainted infant formula scandal . WHO representative said scandal shows up flaws in China 's food supply chain . Most people in China dead , 53,000 children ill from tainted milk powder .
Head of China 's health watchdog concerned over tainted infant formula scandal . WHO representative said scandal shows up flaws in China 's food supply chain . Most people in China dead , 53,000 children ill from tainted milk powder .