Infectious disease specialist Alejandro Macías spoke to CNN about the decision of the US Centers for Disease Control and Prevention (CDC) to reinstate its recommendation for the use of masks in fully vaccinated people in areas of USA with "substantial" and "high" transmission of covid-19.
On another topic, the former national commissioner against AH1N1 influenza in Mexico said that returning to face-to-face classes is a possibility and a necessity to prevent educational establishments from deteriorating due to abandonment.