 For plasma donations, blood was often mixed with other donors' samples and reinjected after plasma extraction.Wu, Rou, and Detels (2001) found that 12.5% of plasma donors in eastern China tested positive for HIV, compared to 1.3% of non-donors; infected donors spread the disease to marital and other sexual partners.In 2004, official estimates put the range of people infected via unsafe blood donation practices across the most heavily impacted provinces——Henan, Hebei, Anhui, Shaanxi, and Shanxi——between 200,000 and 300,000.