epa09471546 A nurse prepares a dose of the Chinese Sinopharm vaccine, in Caracas, Venezuela, 14 September 2021 (issued 16 September 2021). Venezuelan parents show fear and concern at the announcement of President Nicolas Maduro on vaccinating children three years and older against covid-19, on the occasion of the return to face-to-face classes, despite the rejection of teachers and students, who consider that the sanitary conditions for the return do not exist.  EPA/RAYNER PENA R