ANCHOR: And an update on Chinas tainted milk powder controversy. Today Taiwan announced that it is banning all imports of mainland Chinese dairy products. Authorities are urging citizens to take their infants for check-ups if they have used Chinese milk powder. Heres more. STORY: Milk powder laced with melamine has so far made more than 54,000 children ill. 13,000 have been admitted to hospital and over a hundred are in serious condition with kidney stones. Four deaths have been reported so far. At a hospital in Taipei a grandmother says shes worried for babies and their families. [Mrs. Liao, Concerned Over Milk]: "I am afraid that my grandson has eaten tainted milk powder. I am so worried. Because there are just so many reports about tainted Chinese milk powder." Taiwan has set up centers where citizens can have their milk powder tested for free and plans to send experts to mainland China to examine the milk powder contamination. Since the initial milk powder crisis arose, China says its found melamine in nearly 10 percent of milk and drinking yogurt samples from its three major dairy companies. Melamine has now also been found in candy, buns and carton milk sold to other countries and regions. It has unleashed further fear in markets already shaken by a string of "made-in-China" scandals last year. Other markets that have banned or recalled Chinese milk products so far include Hong Kong, Japan, Brunei, Singapore, and Malaysia, and official worry has been spreading. China has the world's third biggest dairy sector by volume, after India and the United States.