Dr. Xu joined the School of Public Health at HKU in late 2013. She graduated with a PhD in Epidemiology at Chinese Center for Disease Control and Prevention (China CDC) in 2004. During 2005-2013 She worked in National Influenza Center, National Institute for Viral Disease Control and Prevention, China CDC, She was responsible for epidemiological routine influenza surveillance and management of Chinese national influenza surveillance network. Her current research focus is in infectious disease epidemiology.