A Chinese quarantine staff checks the body temperature for passengers on arrival at the Gongbei Customs near Zhuhai city in south China's Guangdong Province on April 28, 2009. Chinese government announced on Tuesday that no human cases of swine flu have been detected in China and that all precautions against the disease's possible spread have been taken. [Xinhua]

Chinese quarantine staff sanitize and disinfect a foreign sea vessel on arrival at the Ningbo seaport in east China's Zhejiang Province on April 28, 2009. [Xinhua]