Brazil’s health care system is collapsing under a new strain of Covid-19 As Covid-19 cases and deaths pile up in Brazil, scientists have discovered a new strain of the coronavirus there - one that could potentially be more contagious and lethal. Matt Rivers is in Iranduba and Manaus where hospitals are out of oxygen and ventilators, and rows and rows of graves are being dug every day. https://cnn.it/3cltGVc | CNN