Medical workers carry signs to thank residents and firefighters who gathered to applaud them outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

People applaud to show appreciation to medical workers fighting in the front line of combating Covid-19 pandemic outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

Medical workers wave to thank residents and firefighters who gathered to applaud them outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

A resident shows appreciation to medical workers fighting in the frontline of combating Covid-19 pandemic outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

A medical worker carries a sign to thank residents and firefighters who gathered to applaud them outside Lions Gate Hospital in North Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

Medical workers carry signs to thank residents and firefighters who gathered to applaud them outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

A resident waves to show appreciation to medical workers fighting in the front line of combating Covid-19 pandemic outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)

A resident holds up a sign to show appreciation for medical workers fighting in the front line of combating Covid-19 pandemic outside Lions Gate Hospital in Vancouver, Canada, April 17, 2020. As of Friday night, there were 31,872 COVID-19 cases in Canada. (Photo by Liang Sen/Xinhua)