Farmers who raise pigs in the central Henan, one of the country's swine exporters, are closely monitoring their herds after the province stepped up measures against it.

"Now I only use the swine feed produced by local companies," said Su Xinmin, a farmer in Xingyang City. "I am disinfecting my pig pens everyday in hope of seeing through this tough time without losing any stock."

Guangdong Province is examining pork products imported from the United States, according to the provincial inspection and quarantine bureau. About 22,475 tonnes of pork and pork products were shipped to Guangdong from the United States during the first three months of the year.

The agricultural and livestock authorities of Jiangxi Province, one of China's major pig providers, has called on pig raisers and authorities to reinforce farm disinfections and purchase equipment for better swine flu monitoring.

Pork sales remained normal in some supermarkets in Nanchang, the provincial capital. Some salespeople said the sector may not be seriously affected unless swine flu is detected in China's own market.

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Editor:Yang Jie