He is the Director and Party Branch Secretary of the Department of Infectious Diseases at Huashan Hospital affiliated to Fudan University, the Director of the Internal Medicine Department of the Shanghai Medical College, and also the leader of the Shanghai Medical Treatment Experts Group, deputy director of the Shanghai Institute of Liver Diseases, and standing committee member of the Infectious Disease Branch of the Chinese Medical Association.

[9][10] On March 15, Zhang posted on the official WeChat account of the Department of Infectious Diseases, Huashan Hospital, Fudan University.

The post reads, "I originally believed that if China had properly controlled the situation, the world would also follow suit.

East Asian countries such as Singapore, Japan, and South Korea did very well but Europe has now become the new epicenter of the epidemic, bringing us huge uncertainty.

He predicted, "With respect to the current global anti-epidemic measures, it is basically impossible for this epidemic to end this summer.