Four Chinese women and two men caught the virus in southwest Sichuan province, the Health Ministry said on late Monday.

In Shanghai, a 47-year-old Chinese-American woman tested positive for swine flu, while a 12-year-old American boy was confirmed infected in the southeastern city of Fuzhou, in Fujian province.

A new case was also confirmed in southern Guangdong province, next to Hong Kong, in an 11-year-old American-Chinese boy who arrived from San Francisco with his mother, the ministry said.

Out of China's 89 cases, 39 are still being treated, according to the official Xinhua News Agency.

The World Health Organization says that as of Monday 73 countries have officially reported more than 25,000 have been infected, including 139 deaths. -- AP