Chinese melamine scandal widens
The toxic chemical melamine is probably being routinely added to Chinese animal feed, state media has reported.
Correspondents say the unusually frank reports in several news outlets are an admission that contamination could be widespread throughout the food chain, reported BBC.
The melamine scandal began early in September, when at least four Chinese babies were killed by contaminated milk, and thousands more became ill.
The news led firms across Asia to recall products made from Chinese milk.
The problem widened last weekend when the authorities in Hong Kong reported that melamine had also been detected in Chinese eggs.
Four brands of eggs have since been found to be contaminated, and agriculture officials speculate that the cause was probably melamine-laced feed given to hens.
Melamine is high in nitrogen, and the chemical is added to food products to make them appear to have a higher protein content.
Several state newspapers carried reports on Thursday suggesting that the addition of melamine to animal feed was widespread.
The feed industry seems to have acquiesced to agree on using the chemical to reduce production costs while maintaining the protein count for quality inspections," the state-run China Daily said in an editorial.
"We cannot say for sure if the same chemical has made its way into other types of food," the newspaper added.
The practice of mixing melamine into animal feed is an "open secret" in the industry, the Nanfang Daily reported.
Chinese officials have been criticised for initially covering up the melamine scandal - as they have in the past for other health scares.
Despite a nationwide campaign to raise food safety standards and reassure consumers, China's broken-down food safety inspectorate is still failing to catch and report lapses in standards when they happen.
Analysts say that Friday's news reports are an unusual departure for Chinese officials, marking what amounts to a tacit government admission that the problem could affect many parts of the food supply.