After being released on July 19, 2004, Jiang Yanyong remained under long-term surveillance and in a state of house arrest; on March 22, 2005 he regained freedom of movement, but was told he was barred from accepting interviews and given other restrictions, and approval to go abroad was not granted.
On June 1, 2004, Jiang Yanyong and his wife Hua Zhongwei were taken away by the authorities while on their way to the hospital; Hua Zhongwei was released two weeks later, Jiang Yanyong was released on July 19, and the authorities denied the incident.
On February 24, 2004, Jiang Yanyong wrote to the National People's Congress, the CPPCC, the leaders of the CCP Politburo and the State Council, calling for a reevaluation of June Fourth, 1989, and recounting what he witnessed at the 301 Hospital in treating the casualties.
On April 4, 2003, military doctor Jiang Yanyong learned that Health Minister Zhang Wenkang had claimed there were only 12 SARS cases in Beijing. He then told the real case numbers from military hospitals to CCTV and Phoenix TV, and the information was relayed out by foreign journalists.
On April 3, 2003, Health Minister Zhang Wenkang told a press conference in Beijing that Beijing had only 12 SARS cases and 3 deaths, and said it was safe whether or not you wore a mask; the next day, Jiang Yanyong disclosed higher figures from military hospitals.