Question: What is a viral respiratory disease of zoonotic origin caused by the SARS coronavirus, that was researched by a Chinese virologist who, in 2014, was ranked as 11th in the world by Thomson Reuters?
Sentence (from "Yi Guan"): In early 2017, Guan warned that the H7N9 influenza virus "poses the greatest threat to humanity than any other in the past 100 years."
Relevant evidence: No