Het is waar dat het bewijs voor maskers eerder zwak was. Maar dat is veranderd

(200629) — BRUSSELS, June 29, 2020 (Xinhua) — A man wearing a face mask walks on the street in Brussels, Belgium, June 29, 2020. The chief of the World Health Organization (WHO) said Monday that all countries living with COVID-19 will be the new normal in the coming months, as the pandemic had already infected more than 10 million people worldwide, including nearly 500,000 deaths. (Xinhua/Zhang Cheng) – Zhang Cheng -//CHINENOUVELLE_0812014/2006300834/Credit:CHINE NOUVELLE/SIPA/2006300840 *** local caption *** 00969909