(AP) -- New testing has found melamine tainting in another 31 brands of Chinese milk powder.
The new testing follows earlier results showing widespread contamination among infant formula blamed for the deaths of four children and kidney ailments among 54,000 others.
Cadbury milk chocolate bars are seen in a store in Beijing, China, Monday.

Meanwhile, Hong Kong authorities said the amount of melamine found in samples of chocolate made at British candy maker Cadbury's Beijing factory was legally acceptable for human consumption.
Tuesday's announcement came a day after the company recalled 11 items sold in parts of Asia and the Pacific.
Chinese food safety personnel check the fresh milk at a milk collection station in Chengdu, China, Sunday.

Cadbury said the Hong Kong test results did not change their decision to recall the products from the Beijing plant.
A researcher in Wuhan, China, checks for melamine in milk samples collected from stores.
