1. Brazil downgrades efficacy of Chinese COVID-19 vaccine | TheHill  The Hill
  2. Chinese Covid-19 vaccine far less effective than initially claimed in Brazil, sparking concerns  CNN
  3. Sinovac: Brazil results show Chinese vaccine 50.4% effective  BBC News
  4. Brazil researchers now say China’s Sinovac vaccine is 50% effective — lower than announced earlier  CNBC
  5. Can You Mix And Match COVID Vaccines? Can You Get COVID After The First Vaccine Dose?  CBS New York
  6. View Full Coverage on Google News

source https://news.google.com/__i/rss/rd/articles/CBMieGh0dHBzOi8vdGhlaGlsbC5jb20vcG9saWN5L2hlYWx0aGNhcmUvcHVibGljLWdsb2JhbC1oZWFsdGgvNTM0MDYwLWJyYXppbC1kb3duZ3JhZGVzLWVmZmljYWN5LW9mLWNoaW5lc2UtY292aWQtMTktdmFjY2luZdIBfGh0dHBzOi8vdGhlaGlsbC5jb20vcG9saWN5L2hlYWx0aGNhcmUvcHVibGljLWdsb2JhbC1oZWFsdGgvNTM0MDYwLWJyYXppbC1kb3duZ3JhZGVzLWVmZmljYWN5LW9mLWNoaW5lc2UtY292aWQtMTktdmFjY2luZT9hbXA?oc=5