In Fort Detrick, Maryland, the U.S. Army has cutting-edge labs researching viruses. In August 2019, Ft. Detrick labs were closed and a number of pneumonia cases, or illness similar to pneumonia, occurred in Maryland. What happened when the labs were shut down? What does the U.S. need the labs for? Dr. Qiao Liang tries to connect the dots and get closer to the facts.

On-camera reporter: Qiao Liang

Scriptwriter: Qiao Liang

Video editor: Zhang Wanbao, Shen Anqi

Filmed by Zhang Wanbao, Zhou Jinxi

Chief editor: Wang Xin

Producer: Wen Yaru

Director: Zhang Shilei

Supervisor: Fan Yun