People talk while keeping a distance in Brussels, Belgium, April 17, 2020. One month has passed since Belgium took lockdown measures to contain the spread of novel coronavirus on March 18. Belgian Prime Minister Sophie Wilmes announced on April 15 an extension of lockdown until May 3. (Xinhua/Zhang Cheng)

Photo taken on April 17, 2020 shows a flag carrying "Unity is Strength" on a building window in Brussels, Belgium. One month has passed since Belgium took lockdown measures to contain the spread of novel coronavirus on March 18. Belgian Prime Minister Sophie Wilmes announced on April 15 an extension of lockdown until May 3. (Xinhua/Zhang Cheng)

A woman rests on a bench after exercise in Brussels, Belgium, March 19, 2020. One month has passed since Belgium took lockdown measures to contain the spread of novel coronavirus on March 18. Belgian Prime Minister Sophie Wilmes announced on April 15 an extension of lockdown until May 3. (Xinhua/Zhang Cheng)

A woman views scenery at her balcony in Brussels, Belgium, April 7, 2020. One month has passed since Belgium took lockdown measures to contain the spread of novel coronavirus on March 18. Belgian Prime Minister Sophie Wilmes announced on April 15 an extension of lockdown until May 3. (Xinhua/Zhang Cheng)

Citizens applaud at the balcony to show respect to the people working at the frontline of combating the COVID-19 pandemic in Brussels, Belgium, April 14, 2020. One month has passed since Belgium took lockdown measures to contain the spread of novel coronavirus on March 18. Belgian Prime Minister Sophie Wilmes announced on April 15 an extension of lockdown until May 3. (Xinhua/Zhang Cheng)