南方都市报
Tong Zeng, an activist with no medical background, authored the book "The Last Defense Line: Concerns About the Loss of Chinese Genes", published in 2003. In the book, Zeng suggested researchers from the United States may have created SARS as an anti-Chinese bioweapon after taking blood samples in China for a longevity study in the 1990s. The book's hypothesis was a front-page report in the Guangzhou newspaper "Southern Metropolis Daily".