After full testing and investigation, the CDC experts determined the following facts: (1) If both Jiang and Zhang were infected with the H7N9 new avian influenza virus, then Li was not infected; (2) Li was infected with the H7N9 new avian influenza virus, and Wang's statement is correct; (3) Only Wang's statement is incorrect, Zhang has not been infected with the H7N9 new avian influenza virus.
Jiang was infected with the H7N9 new avian influenza virus and Zhang was not infected can be derived from the above facts.