Focusing his research on
influenza viruses throughout his career, Guan has identified all the major precursors and transmission pathways of the
H5N1 variant that circulates in Southeast Asia, Europe and Africa and has provided most of the
World Health Organization recommended pre-pandemic H5N1 vaccines strains. Guan has, also, initiated the systematic study of
H9N2 viruses, which, along with
H5 viruses that are now regarded as the most likely novel influenza subtypes to cause a
pandemic. Guan has defined the role of domestic ducks in harboring and spreading influenza viruses and made major contributions in recognizing the emergence, evolutionary history and development of the 2009 H1N1 pandemic virus and revealed the genesis, infection source, evolutionary pathway and possible transmission route of the 2017 emerging H7N9 influenza virus. Guan has also contributed to the identification of animal reservoirs for coronaviruses, leading a team to identify bats as a reservoir host for SARS-CoV and palm civets as an intermediate host for SARS-CoV. Guan has worked for various highly esteemed universities and hospitals over the years. beginning his career from 1983 to 1986 as resident doctor (teaching assistant) (department of paediatrics) at
First Affiliated Hospital of Jiangxi Medical College: Nanchang, CN. Soon after becoming "doctor-in-charge" (lecturer) (department of paediatrics) at
Shantou University Medical College: Shantou, CN from 1989 to 1992. Moving on from there between 1993 and 1995 Guan was a Ph.D. candidate (department of microbiology) at the
University of Hong Kong: Hong Kong, HK. He then moved to America between 1995 and 1997, where he completed his Ph.D. in the department of virology and molecular biology at
St. Jude Children's Research Hospital: TN, Memphis, AM. Guan then returned to
University of Hong Kong: Hong Kong, HK, where he was employed from 1997 to 2000 as research assistant professor in the department of microbiology, then 2001 to 2013 as associate professor and senior lecturer in the department of microbiology, and from 2005 to 2011 as professor in the department of microbiology and finally from 2013 to 2016 he became the director of the Centre of Influenza Research. Guan Yi currently hold the position of chair professor in emerging viral diseases (school of public health) 2015 to present day. Guan currently hold multiple high positions in highly esteemed health organizations across China. He is director (Joint Influenza Research Centre (HKU & SUMC)) at
Shantou University Medical College: Shantou, CN 2004 to present, director (International Institute of Infection and Immunity)
Shantou University Medical College: Shantou, CN 2007 to present, director (State Key Laboratory for Emerging Infectious Diseases)
University of Hong Kong: Hong Kong, HK 2005 to present, Daniel C K Yu Endowed Professor in Virology (School of Public Health) at
University of Hong Kong: Hong Kong, HK 2012 to present, Part of the
Joint Institute of Virology (STU/HKU) : Shantou, CN 2015 to present, and Joint Laboratory for International Cooperation in Virology and Emerging Infectious Diseases: China, CN 2016 to present in the Ministry of Education. ==COVID-19 pandemic==