Goo-goo Melamine, Part IV

Via ProMED-mail: Radio New Zealand reports that the melamine crisis in China has spread to 53,000 infants, 13,000 of whom are hospitalized. Rumors reach back to December 2007, and the UN wants an explanation:

The World Health Organisation has asked the Chinese authorities to explain why it took months for the tainted milk scandal to be made public.
The UN children's agency UNICEF has asked Chinese authorities to launch a full investigation into the matter.